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Despite all the advances in technology of the last decade, batteries are still shockingly bad – taking up the bulk of most modern devices and rarely lasting a full day of use. Which is where whopping great external battery packs like the Poweradd Apollo Pro come in, with automatic solar charging and 23,000mAh of power – or about 3.5 iPads worth. I’ve been putting one to the test. And today, we’ll be offering it in our giveaway!

The Poweradd Apollo Pro costs $110. If your interests lie solely with solar charging ability and not a battery pack, the Anker 14W foldable USB charger will perform better, at only $70. Poweradd also offer a smaller form-facter, 10,000mAh model for $45, more suited to small devices like an iPhone. EC Tech offer a similarly sized battery pack (22,400 mAh) for $50, though without any solar charging abilities.

First Impressions

Our purchase was supplied with a free carry case separate to the main package. This thing is heavy at just over 1.3 kilograms in the box, and not much lighter when out of it.

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What’s in the box?

A ridiculously large number of power adapters is supplied for every DC power jack known to humanity; these are used for laptops, or generic 12V input like an Arduino. On the other side is a USB port, with an extendable cable supplied and adapters for mini-USB, micro-USB, and an old style Apple 30 pin connector – yet curiously not the new Lightning connector. Since it’s a standard USB port, you can just plug your own adapter straight in – the supplied mini cable is just for convenience.

An AC power adaptor is also supplied for charging the battery from a wall plug, in case you live somewhere like the UK where the sun rarely shines and all solar devices are essentially rendered useless.

  • 10 DC barrel jack charging heads
  • 50 centimeter extension cable for DC charging
  • Coiled USB charging cable
  • Micro USB, Mini USB, Apple 30 pin, and minuscule 1mm wide jack (I have no idea what it’s for) USB charging heads
  • User manual

The USB charger heads and cables aren’t interchangeable with the DC jack – which is a good thing, because you’d fry your mobile devices if you pumped 12V into them, which is what the DC power is designed for. A simple slide switch changes between 12C, 16C, and 19C, for charging larger devices like laptops. No AC power socket is available. Here’s the full list of the more obscure DC plugs supplied.

  • A – 6.00×4.25 – Sony VAIO
  • B – 6.25×3.00 – Toshiba Satellite A105, M35
  • C – 5.50×2.10 – Toshiba T1950, T4700 / Acer Aspire 1200
  • D – 4.75×1.70 – ASUS Eee 900, 1000
  • E – 5.50×1.70 – Acer Aspire One AO722 AO725
  • H – 5.00×3.25 – Samsung N130, N310
  • I – Dell 3Pin – Any Dell Laptop use a 3 Pin adapter
  • J – 7.40×5.00 – HP Pavilion DV6 / HP G60, G61/ HP Compaq CQ60, CQ61 / HP 550 / Dell inspiron 1525, E1505
  • K – 7.90×5.40 – ThinkPad T60, X60, R6

Although it’s rare you’d need anything other than a single adapter, it would have been nice if the supplied carry case had room for all the adapters and cables too; this seems a common feature on the foldable solar panels.

A single click of the bright orange button displays the current charge level – it’s supplied fully charged. Hold down for a longer time on the button and the front super-bright white LED is activated – not that I can see anyone wanting to use this hulking beast as a wieldy flashlight, but it’s useful for emergencies.

Charging Time

A full charge of my third-generation iPad took just about 6 hours; the Nexus 7 took about 4 hours; my iPhone 5s took about 2 hours. After charging both the iPad and Nexus, the battery was showing a 25% charge left, which works out roughly with stated battery capacities of 11,560 mAh for the iPad, 4,235 mAh for 2012 model Nexus 7, from a total 23,000 mAh in the Poweradd Apollo Pro.

The unit can be charged either from a wall plug, with the full battery replenished overnight; or can be trickle charged from solar. The problem with the solar charging is that it doesn’t appear capable of charging the device once the battery has dropped to 50% or less. I suspect this is because the small solar panel just doesn’t have enough oomph (that’s a technical term) to kickstart the battery charging process, even in bright sunlight – so relying upon this for an emergency situation where there’s no wall outlets available probably isn’t a good idea. Batteries requires a large voltage for the initial stages of charging; later, a smaller charge is all that’s needed, at which point the solar cell can handle. As far as I can tell, this isn’t confirmed in the product literature, so it may be the case that our British springtime sun just isn’t strong enough.

In theory, a full charge of the battery will take 24 hours of optimal sun (15V 230mAh solar cell, for a 23000mAh/85Wh battery capacity)

Living with the Apollo Pro

Here’s where I hit a snafu: I own a MacBook air, which can’t be charged with the Apollo Pro due to the lack of MagSafe adapter. In fairness, this is Apple’s fault and not Poweradd’s — they make non-standard power cables with tiny micro-circuits in them to prevent third party devices from working without a licence. It’s a part of the Apple tax, but it does somewhat limit the usage of these niche power solutions. Regular laptops and anything that charges from USB will work fine.

In practice, I was able to use the solar panel to keep my iPhone charged for a week without requiring any external input. Once I tried to charge a tablet as well, the battery depleted to 50% and solar no longer seemed to replenish any charge.

In terms of usability, I was expecting to have to switch modes between charging or discharging – that’s not the case. Solar charging occurs automatically when placed into sunlight. Charging a device requires a single push of the button; and solar charging/battery discharging can be done simultaneously. The only real setup you need to do is ensuring the correct DC voltage is set for your laptop.

Should you buy the Poweradd Apollo Pro?

I’m in two minds about the Apollo Pro. On the one hand, my dreams of running away to live off grid or survive the zombie apocalypse have been thoroughly dashed; this battery will need a wall socket to fully charge – the solar is just an added extra that will prolong its life as long as you don’t use it too much at a time.

On the other hand, 23,000mAh is a truly monstrous capacity that, in practice, will provide a full charge for an iPad, a Nexus 7, and a mobile phone – which could make all the difference if you’re stranded in your car or otherwise; and the ability to run other DC devices that require higher power is a great addition.

MakeUseOf recommends: As long as solar charging isn’t your priority, the Poweradd Apollo Pro is great external battery pack. For purely solar charging, look elsewhere.

How do I win the Poweradd Apollo Pro?

You may enter by submitting your name and email address. You’ll receive one entry simply by doing so.

After that, you’ll also be offered various methods to earn additional entries. They range from sharing a link to this giveaway on social networks; to commenting or visiting a specific page. The more you participate, the higher your chances of winning! You will receive 5 additional entries into the giveaway for every successful referral via your shared links.

This giveaway begins now and ends Friday, May 9. The winner will be selected at random and informed via email. View the list of winners here.

The Winner

Congratulations, Gareth Howe! You would have received an email from jackson@makeuseof.com. Please respond before May 22 to claim your prize. Enquires beyond this date will not be entertained.

Send your products to be reviewed. Contact Jackson Chung for further details.

  1. Shaun
    March 11, 2016 at 4:49 pm

    I managed to modify my apple charger so that it works with this

  2. Nat
    May 30, 2014 at 7:21 pm

    This would look great on the dash of my car!

  3. Morrison
    May 10, 2014 at 7:29 am

    Bigger the better, but 23kmAh is substantial

  4. Eileen
    May 10, 2014 at 4:36 am

    Yes...for batteries, bigger IS better!

  5. Dorothy H
    May 10, 2014 at 2:13 am

    Bigger is better. 23,000 mAh is about right.

  6. Annamarie M
    May 9, 2014 at 6:28 pm

    Bigger is better if and only if it's portable/handy. Optimal External Battey Pack capacity is 23000mAh.

  7. Ariel C
    May 9, 2014 at 4:26 pm

    Bigger is always better!

  8. Narinder Chana
    May 9, 2014 at 2:59 pm

    No bigger is not better. Smarter is better.

  9. Andy CSL
    May 9, 2014 at 1:46 pm

    almost the moment of truth now for the raffle.... crossing fingers to win this one.

  10. Carolyn B
    May 9, 2014 at 7:12 am

    I would leave it in my car. I want portable & powerful.

  11. Rose Holloway
    May 9, 2014 at 3:09 am

    Bigger is better and 23,000mA

  12. littleneko
    May 9, 2014 at 12:22 am

    Bigger is better as long as it's not too heavy/causes issues.

  13. Charlie
    May 8, 2014 at 7:49 pm

    No, since I don't need to power many devices I would rather have a more portable one.

  14. Ahmed
    May 8, 2014 at 11:58 am

    of course yes, but should be portable

  15. Jason Johnson
    May 7, 2014 at 6:14 pm

    I can't help wondering why the solar doesn't work at the 50% mark. I would think this device would be much more useful if that wasn't the case.

  16. Francesco Fiorino
    May 7, 2014 at 5:43 pm

    Bigger is always better, but less portable

  17. Shawn
    May 7, 2014 at 5:26 pm

    Bigger is better :)

  18. Nikhil N
    May 7, 2014 at 4:25 am

    In my opnion Bigger is always better . And same applies for external battery pack capacity.

  19. John G
    May 6, 2014 at 9:49 am

    Something that can power my entire house. That is the ideal size.

  20. ProfessAndObey
    May 6, 2014 at 2:31 am

    It depends on the use case. For this one bigger is better. I figure I would leave it on the dashboard in my car and just grab it when I need it.

  21. Joseph
    May 6, 2014 at 12:09 am

    100000mAh

  22. Emh-el L
    May 5, 2014 at 4:37 pm

    20k - 30k mah capacity?

  23. Kelly Rivett
    May 5, 2014 at 4:34 am

    Enough to charge my laptop. I am constantly in remote areas without access to power to charge my phone or laptop. If I have enough for that then it would all be good.

  24. Alexey Petrov
    May 4, 2014 at 8:52 pm

    10000mAh

  25. Victoria Ess
    May 4, 2014 at 3:52 pm

    I don't think bigger is necessarily better. It's about how efficient the battery system is.

  26. Marijan
    May 4, 2014 at 8:34 am

    More is better . 10000mAh at least .

  27. Peter V
    May 4, 2014 at 3:46 am

    When it comes to external battery packs (preferably solar), bigger is better in the capacity sense—I want to be able to collect all the charging power I can, but bigger is definitely not better in the physical size sense—I want my charger to be as portable as possible. Because those two wishes seem to contradict one another, each buyer needs to strike the balance where it suits him/her.

  28. Gaurav B
    May 4, 2014 at 3:39 am

    Bigger is not necessarily better. If I can get 8-12 hours, I will be happy.

  29. Landis
    May 4, 2014 at 3:34 am

    I think bigger is usually better especially for external batteries.

  30. Florentin
    May 3, 2014 at 9:48 pm

    I think 8-10.000 mA is ok.

  31. carniemechanic
    May 3, 2014 at 6:05 pm

    size not withstanding, I would use the hell out this.

  32. Jan H
    May 3, 2014 at 5:13 pm

    This one looks quite all right to me

  33. Poignant T
    May 3, 2014 at 1:10 pm

    bigger is better! 10000mAh works.

  34. Gheorghe T
    May 3, 2014 at 1:09 pm

    Bigger is better, but where can I use 25Ah power? Perhaps if the car battery would be without power ....

  35. Lloyd V
    May 3, 2014 at 10:44 am

    I find that 1700mAH lasts my iPhone 5s through the day without needing to compromise on portability.

  36. Peter H
    May 3, 2014 at 5:11 am

    Bigger is better. 23,000mAh is sufficient.

  37. Al Sam
    May 2, 2014 at 9:12 pm

    bigger is better....10,000 mAh would be ideal

  38. Matthew W
    May 2, 2014 at 8:25 pm

    6,000 mAh. Enough to jump my car battery.

  39. Gherghina
    May 2, 2014 at 7:21 pm

    5.000-7.000 mAh is sufficient.
    25.000 mAh is ideal for a week in isolation

  40. Giuseppe P
    May 2, 2014 at 2:07 pm

    10000mAh shoul be good

  41. Simone
    May 2, 2014 at 1:11 pm

    I think 10000mAh

  42. Norakmal Mohamad
    May 2, 2014 at 12:22 pm

    Bigger is not necessarily better & i think the optimal battery pack capacity is near to 20,000 mAh

  43. Denis K
    May 2, 2014 at 11:00 am

    Giving out current in 1?, as well as having capacity from 12 000 up to 16 000 ???

  44. thiagu
    May 2, 2014 at 9:15 am

    bigger is better. currently thinking 10000 mah was optimal for mobiles.

  45. Divesh K
    May 2, 2014 at 9:07 am

    its better to be big
    the optional battery pack capacity is near to 20,000 mAh

  46. Mishaal F
    May 2, 2014 at 9:01 am

    i think bigger is usually better

  47. Jon D
    May 2, 2014 at 8:45 am

    bigger is usually better

  48. Stephanie S
    May 2, 2014 at 5:42 am

    I kind of like this idea. Certainly glad you stated it wasn't a "survivalist" tool. :) Yes, in some cases, bigger is better but you then have to consider the weight as things get bigger. James mentioned that it was heavy and, since I live in the U.S. and not a metric guru, I have no idea what that weight. It certainly looks heavy duty and if I am out and about, it would definitely come in handy to charge my iPhone.

  49. Carol Oddy
    May 2, 2014 at 5:40 am

    Bigger is not always better, it will charge an ipad and a iphone which I think is good.

  50. John P
    May 2, 2014 at 2:09 am

    As someone said above, bigger is better as long as it doesn't get to a stupid size. No use having something the size of a full scale Honda generator to support your 8" Samsung Tab

  51. Mark Hansen
    May 2, 2014 at 1:35 am

    Depends on what you use it for. For your phone, 3-6k is enough. But if you're planning to go off the grid for a week or two, 23k solar charger is great. The solar charging needs a higher capacity though imo, as you can't always expect it to be sunny (at least not where I'm from).
    Bigger is sometimes better.

  52. Suresh K Volam
    May 2, 2014 at 12:08 am

    Yes, I always feel bigger better. So far I have a 12000 one.

  53. Daniel M
    May 1, 2014 at 11:29 pm

    bigger is better

  54. nitin
    May 1, 2014 at 7:17 pm

    Definitely its better if its bigger. However, this seems to be like the optimum capacity that should be sufficient enough.

  55. Adrian
    May 1, 2014 at 6:47 pm

    around 20000mAh

  56. Amine D
    May 1, 2014 at 6:05 pm

    Bigger is ALWAYS better :)

  57. Andras K.
    May 1, 2014 at 5:52 pm

    23,000mAh is more than enough

  58. Jgutz87
    May 1, 2014 at 5:32 pm

    bigger is better

  59. D-J Russell
    May 1, 2014 at 4:40 pm

    Bigger is always better, as long as the pack doesn't grow to a stupid size, it needs to stay easily pocketable .

  60. Patrick Channon
    May 1, 2014 at 4:27 pm

    Finally her is a product that let's you used your electronic goods while not harming the environment. It certainly seems powerful enough, and here in Africa there is more than enough sun to charge it up for my goodies to use!

  61. Martin Watts
    May 1, 2014 at 4:03 pm

    The bigger the better, especially as a Brit using the upcoming summer to grab some charge for the rest of the year...

  62. Joses L
    May 1, 2014 at 3:34 pm

    Around 5000mAh for tiny chargers, I guess? As big as possible for zombie apocalypses, lol.

  63. Hal
    May 1, 2014 at 1:48 pm

    23000 is plenty for anyone

  64. Liam
    May 1, 2014 at 12:20 pm

    bigger is usually always better. The size doesn't really bother me as long as it gets me out of a pickle when it needs to.

  65. Chris Kastamonitis
    May 1, 2014 at 11:49 am

    23000mAh is plenty sufficient for my needs. i have an iphone to charge!

  66. Alex
    May 1, 2014 at 10:18 am

    I think 23k is more than enough

  67. moorandro
    May 1, 2014 at 8:56 am

    Above 12K it would be okey

  68. Bill
    May 1, 2014 at 7:41 am

    big bigger biggest

  69. Timothy C
    May 1, 2014 at 7:00 am

    23K is perfectly fine.

  70. Nikolai M
    May 1, 2014 at 6:10 am

    Size matters. The bigger the better. (:

  71. Thomas Stachelski
    May 1, 2014 at 5:59 am

    More is better especially if you have more then one device.

  72. Bill McGovern
    May 1, 2014 at 3:05 am

    12 to 15K mAh should be enough for me.

  73. DAN J
    May 1, 2014 at 2:49 am

    Maybe 20,00 but then if it's a solar it must be able to recharge and sustain itself.

  74. Steve
    May 1, 2014 at 1:16 am

    WOW, power for the tech toys and Portable!

  75. Elizabeth K
    May 1, 2014 at 1:09 am

    For myself and family 23000mAh is plenty sufficient

  76. jeff
    May 1, 2014 at 12:55 am

    bigger is normally better but it still has to be portable enough.

  77. Walter Van Tine
    May 1, 2014 at 12:48 am

    More is better! 25K is great!

  78. Sherry K
    April 30, 2014 at 11:21 pm

    Bigger is better. 23,000 is good.

  79. Sharon H
    April 30, 2014 at 11:14 pm

    10,000 would work for me - all I need is a few minutes boost daily when camping

  80. D.r. W
    April 30, 2014 at 10:58 pm

    Bigger is better!

  81. Bill Fleet
    April 30, 2014 at 10:50 pm

    I usually want as much as I can carry.

  82. Debbie Bashford
    April 30, 2014 at 10:03 pm

    Bigger capacity is better, bigger in size and weight not so much

  83. Rory
    April 30, 2014 at 9:42 pm

    The bigger the better, but at some point if the battery pack is not pocket sized, or even messenger bag sized too heavy its a point of diminishing returns

  84. Dmitry Y
    April 30, 2014 at 9:09 pm

    The bigger the better. But the device must still stay enough portable, not becoming a huge and heavy box. 20 000 for me is more than enough, optimal.

  85. Dave Wells
    April 30, 2014 at 8:35 pm

    Bigger is better in this instance and I think 23,000mAh is optimal.

  86. Viktor
    April 30, 2014 at 5:33 pm

    23,000mAh

  87. Mary M
    April 30, 2014 at 3:35 pm

    Bigger is better - usually. As you stated "23,000mAh is a truly monstrous capacity" and "In theory, a full charge of the battery will take 24 hours of optimal sun (15V 230mAh solar cell, for a 23000mAh/85Wh battery capacity)"

  88. Gerald Shimizu
    April 30, 2014 at 2:38 pm

    I don't know for both.

  89. Don
    April 30, 2014 at 2:19 pm

    Bigger is definitely better; I'd rather have the juice I need and have to carry a little more weight.

  90. Wilson
    April 30, 2014 at 2:18 pm

    Yes, it is. 20,000+

  91. TawndaM
    April 30, 2014 at 1:57 pm

    Yes... Bigger capacity IS better... Better to have too much than never enough... but I never pay attention to what #s

  92. Sam K
    April 30, 2014 at 1:42 pm

    Bigger is better, up to ~8000mah

  93. Kristy M.
    April 30, 2014 at 1:25 pm

    The more, the better! 10,000-15,000 mAh IMHO

  94. Natalie
    April 30, 2014 at 11:52 am

    Bigger batteries are not necessarily better or needed but optimal is 23000mAh/85Wh.

  95. Colin H
    April 30, 2014 at 11:43 am

    Yes. 10000mAh is good.

  96. Prabhath
    April 30, 2014 at 11:33 am

    OPTIMAL IS 10000 -15000 mAH Battery

  97. Tate S
    April 30, 2014 at 11:23 am

    Bigger is better~!

  98. Beh H
    April 30, 2014 at 11:16 am

    Bigger is better but has to be lighter as well, I think 20000mAh is the optimum capacity.

  99. Sergey
    April 30, 2014 at 10:33 am

    The external battery pack capacity is 23000mAh/85Wh.

  100. linu geore
    April 30, 2014 at 10:33 am

    OPTIMAL IS 10000 -15000 mAH Battery

  101. Mai T
    April 30, 2014 at 10:09 am

    No idea how much, if talking about duration capacity, an external one should last 1 week.

  102. Nikica T
    April 30, 2014 at 9:43 am

    Bigger is better.

  103. Csanad SZOVERFI
    April 30, 2014 at 9:34 am

    Bigger is better definitely! But I guess that there is a limit...optimal would be around 10000 - 15000 mAh. that would be enough for a couple of smartphones (2500-3000 mAh) and a tablet (~4000 mAh)

  104. Nicolas D
    April 30, 2014 at 9:23 am

    Bigger is better in my opinion ;-)

  105. Magnolia B
    April 30, 2014 at 9:22 am

    Looks interesting...

  106. Pierre
    April 30, 2014 at 9:00 am

    Nice alternative or people more lightweight and solar power addicted:

    Look for the Waka Waka power. Superb for solar charging. Can fully charge a Galaxy S3 en still has juice enough or couple of ours of build in led light. If you buy one, one is donated to people in refugee camps that are off the grid:
    http://nl.wakawakafoundation.org/

  107. Pierre
    April 30, 2014 at 8:51 am

    Nice alternative or people more lightweight and solar power addicted:

    Look for the Waka Waka power. Superb for solar charging. Can fully charge a Galaxy S3 en still has juice enough or couple of ours of build in led light. If you buy one, one is donated to people in refugee camps that are off the grid:
    http://nl.wakawakafoundation.org/

  108. Leon G
    April 30, 2014 at 8:06 am

    Bigger is better if the word is about the capacity. The external battery pack capacity is 23000mAh/85Wh.

  109. Pravas Kumar
    April 30, 2014 at 7:48 am

    Bigger is better. That looks portable. I can carry that in my bag back and charge my devices when necessary.

  110. Bjørnar Berntsen
    April 30, 2014 at 7:47 am

    23000mAh/85Wh battery capacity

  111. Gregory B
    April 30, 2014 at 7:25 am

    23000mAh/85Wh battery capacity

  112. Ghaith E
    April 30, 2014 at 7:23 am

    no idea i fllow your recommendations but i guess in batteries bigger is better

  113. Linda Meyers-Gabbard
    April 30, 2014 at 7:14 am

    Bigger is better not sure what is the optimal.

  114. Mocanu Cristina
    April 30, 2014 at 6:00 am

    I would say anywhere around 21-23k, even 25k would do to power multiple devices for 24 hours. This Apollo powerbank looks nice!

  115. Raazan M
    April 30, 2014 at 5:10 am

    Smaller size with more capacity will be better.

  116. Aditya Bhatt
    April 30, 2014 at 5:08 am

    I think 23,000 mAh is pretty good. I can charge my phone for almost two weeks !

  117. Paul Werner
    April 30, 2014 at 4:52 am

    As big as you can get without making it too large physically

  118. Sampath S
    April 30, 2014 at 4:41 am

    Yes Bigger is always better. 10k mah charger will be sufficient for me.

  119. Steven C
    April 30, 2014 at 4:33 am

    The bigger the better

  120. matt
    April 30, 2014 at 4:21 am

    bigger is always better so my wife says.

  121. Mehul B
    April 30, 2014 at 3:53 am

    Yes ofcourse the bigger is better. The optimal capacity as I heard near 2000....

  122. Darrell Bowman
    April 30, 2014 at 3:45 am

    This is a subjective question? Depends on what you're doing with it, right? All I know is I think this is a neat unit, even if you do have to have it at 75% before it will charge appropriately on solar only.

  123. Anthony
    April 30, 2014 at 3:40 am

    20000 sounds about right

  124. MikeB
    April 30, 2014 at 3:15 am

    Weight, size and number of devices to charge.

  125. Arie W
    April 30, 2014 at 3:06 am

    for backup? bigger is always better :D
    there is no optimum, minimum maybe..

  126. Jim Morgan
    April 30, 2014 at 3:05 am

    Depends entirely on the number and type of devices to be used with it.

  127. Liz
    April 30, 2014 at 3:01 am

    the bigger the better

  128. Aaron
    April 30, 2014 at 2:55 am

    10000 to carry daily, bigger for something for long trips.

  129. Ajith Sen
    April 30, 2014 at 2:16 am

    Bigger is good!

  130. Jesse S
    April 30, 2014 at 1:43 am

    I have an 8,800 mHa battery on my laptop so anything over 20,000 mHa is a good balance between charge time and use.

  131. Zsolt J
    April 30, 2014 at 1:37 am

    For my use, a 10000 would be great for daily use, but this is perfect for longer trips.

  132. Brent V.
    April 30, 2014 at 1:09 am

    I need one of those. Awesome piece of gear.

  133. David Smith
    April 30, 2014 at 1:07 am

    It all depends on the number of devices and length of time you will need an external power source, but more capacity equals longer time you have power. 23000 mAh sounds good to me. It'll keep everything running for a long time.

  134. Brady Wallace
    April 30, 2014 at 12:52 am

    Bigger is always better. 23,000 is the highest I've seen.

  135. ira
    April 30, 2014 at 12:20 am

    Always better to carry around a high capacity battery pack. But weight and size matters too

  136. Joanna
    April 29, 2014 at 11:57 pm

    Yes bigger is better. Optimal Battery Pack capacity depends on the devices you have and how often you are in situations where you need external power supply.

  137. Peter W
    April 29, 2014 at 11:50 pm

    Optimal capacity depends on what devices you own and how often you need external power. With a 23,000 mAh unit, I would be happier than the Geico pig after winning the lottery!

  138. Al Chou
    April 29, 2014 at 11:42 pm

    As big as possible!

  139. Eric R
    April 29, 2014 at 11:08 pm

    Already have a 40w solar panel need more as I go camping for a week at a time.

  140. MarkTGT
    April 29, 2014 at 10:41 pm

    The capicity of this battery sounds great, but must be balanced against weight. If it's not light enough to take with you, it will never get used.

  141. Ismael R
    April 29, 2014 at 10:36 pm

    As long as the battery pack remains easily portable, there is no optimal capacity. Just keep them coming as long as they don't reach the size of car batteries. I want them in a book bag, not a tool cart. I like this one.

  142. Caitlin Zeigler
    April 29, 2014 at 9:01 pm

    Bigger is not always better and the optimal external battery pack capacity is dependent upon how much you'll use it.

  143. Steve Montgomery
    April 29, 2014 at 8:55 pm

    Obviously bigger is better. But the hefty 23,000 mAH storage comes at a hefty weight penalty. I'd recommend that you get storage capacity that is commensurate with the devices you want to re-power and the length of time that you anticipate being away from "shore" power. I don't normally need 23,000 mAH of power (unless I want to jumpstart my truck), so I'd be more comfortable carrying 10 - 15,000 mAH at a max.

  144. Dmitriy S
    April 29, 2014 at 8:28 pm

    23 000 mAh

  145. Benedikt Falke
    April 29, 2014 at 8:11 pm

    23.000 mAH is actually quite a lot, but I can defintly see the use of it, for example on long trips in the mountains or while using multiple devices.

  146. Ed C
    April 29, 2014 at 8:01 pm

    The optimal capacity would be what it takes for a few charges of you important devices

  147. Benjamin
    April 29, 2014 at 7:00 pm

    External chargers are very good but bigger means more awkward. I'm sure there's a balance.

  148. Jon Heil
    April 29, 2014 at 6:54 pm

    Doesn't matter to me on that

  149. Nikunj
    April 29, 2014 at 6:27 pm

    Optimal Battery Pack capacity depends on the devices you have and how often you are in situations where you need external power supply. In my case I use only my Nexus 4 when I'mm out, and for a maximum of couple of days at a time. So 10,000 is enough for me. But then again if I had a 23,000 mAh unit, I would may be take along my tab and laptop too without second thought! Ha!

  150. Julian
    April 29, 2014 at 6:22 pm

    Capacity/size as a factor depends on the situation or devices being charged. For me at least, the ability to charge a phone and tablet would be quite sufficient enough for me for a battery charger I take with me on a daily. Even then, I hardly use it. 23000mah is massive but I could consider it for some situations.

  151. Antonio R
    April 29, 2014 at 6:15 pm

    23000 mHA is nice for me.

  152. Travis Faulkner
    April 29, 2014 at 6:14 pm

    I think bigger is better. I can always use more power so I dont know a top limit.

  153. shikhi
    April 29, 2014 at 6:06 pm

    15000mAh

  154. Gord
    April 29, 2014 at 5:40 pm

    I would say that 23000 mAH is big enough. Bigger not always better.

  155. Marko G
    April 29, 2014 at 5:39 pm

    it dosent make d ifferent for me

  156. Catherine
    April 29, 2014 at 5:34 pm

    Bigger isn't always better, more power in a smaller size would be better.

  157. Isaac C
    April 29, 2014 at 5:13 pm

    I only use it to charge my phone just in case. So, 8 to 10k should be more than enough. And I want the smallest that can hold that capacity.

  158. Angela in AR
    April 29, 2014 at 5:06 pm

    I think size does matter - bigger and better

  159. Abdelrahman El-Feky
    April 29, 2014 at 4:57 pm

    Yes, it's better. I think 20.000 is enough.

  160. Endracion
    April 29, 2014 at 4:57 pm

    This size certainly seems big in comparison to others, but as long as it would extend a laptop's battery life by at least another 2 hours, I think it would be doing a good job.

  161. JeffC
    April 29, 2014 at 4:43 pm

    Bigger is better up until it needs to be on wheels to move it around.

  162. Jonathan S
    April 29, 2014 at 4:36 pm

    20.000 mAh and more is a very good capacity.

  163. Robert S
    April 29, 2014 at 4:33 pm

    more power smaller size always good

  164. TRUNG NGUYEN
    April 29, 2014 at 4:28 pm

    In general, bigger is better. But not always.

  165. donna makayak
    April 29, 2014 at 4:20 pm

    For me bigger or smaller doesn't make the product better.

  166. Joel
    April 29, 2014 at 4:14 pm

    This is pretty great! Like how much space it has, and is a nice option to charge some with solar power.

  167. Alan Andrew Parker
    April 29, 2014 at 4:11 pm

    Of course, bigger is better! A 23,000 mAh battery would be great

  168. Michael T
    April 29, 2014 at 4:10 pm

    A 23000mAh battery is quite nice but the sheer weight and size if the device is not very "portable". It's a nice battery pack to carry with you on a trip but not really portable enough for everyday use.

  169. Alexandru S
    April 29, 2014 at 4:10 pm

    For me around 23,000 mAh is the perfect capacity.

  170. Rick M
    April 29, 2014 at 4:07 pm

    If it is supposed to be portable, then bigger is not always better. For physical size, this solar charger would fit easily on a window sill to get access to outside. If it was too big, there would be risk of it falling off.

    Optimal charging capacity... enough to fully charge two smart phones. If I needed more than that, carrying extra batteries would be more efficient.

  171. Salvador H
    April 29, 2014 at 4:06 pm

    definitely useful

  172. Anne
    April 29, 2014 at 3:53 pm

    Bigger is better, up to the point it gets too heavy to carry around

  173. DanQ
    April 29, 2014 at 3:47 pm

    Enough charge for both my phone and Tab 7 . about 18,000

  174. Patricia
    April 29, 2014 at 3:24 pm

    23,000mAh

  175. Sam
    April 29, 2014 at 3:20 pm

    As long as it would fully charge my device it doesn't matter, though at least 20000 would maybe allow me to charge my phone and my camera!

  176. Alfred Chan
    April 29, 2014 at 3:19 pm

    Of course the bigger the better. :)

  177. Saad Ahmad
    April 29, 2014 at 3:08 pm

    23000 mAH, the bigger the better!

  178. Anthony R
    April 29, 2014 at 3:02 pm

    Bigger is better until it gets too heavy to carry around easily.

  179. Tejash C
    April 29, 2014 at 2:58 pm

    Of course, bigger is better! A 23,000 mAh battery would do!

  180. Peter Goldberger
    April 29, 2014 at 2:56 pm

    The bigger the better, but the bigger the heavier. So, I prefer around 5800 mAh which makes it useable and transportable.

  181. Allan Morris
    April 29, 2014 at 2:52 pm

    I hope this will work to charge my Sony VAIO laptop. Thanks!

  182. joe p
    April 29, 2014 at 2:46 pm

    the most you can get without it feeling like your carrying a briefcase

  183. Helana
    April 29, 2014 at 2:46 pm

    Well, probably, but at some point, portability might be a consideration.

  184. Haravind kumar
    April 29, 2014 at 2:38 pm

    Yes, Bigger is better! I’d definetly go for it. Its More than 20000 mAh

  185. Nikki
    April 29, 2014 at 2:34 pm

    23,000 mAh will be perfect!

  186. robert
    April 29, 2014 at 2:34 pm

    Bigger is better

  187. William Diacheysn
    April 29, 2014 at 2:23 pm

    When you're working with a bunch of electronics and need to keep them charged, you can never have enough battery power.

  188. marcelo
    April 29, 2014 at 2:21 pm

    this is great.

  189. Tim M
    April 29, 2014 at 2:18 pm

    very nice

  190. Mihir C
    April 29, 2014 at 2:13 pm

    Yes of course, bigger is better! I'd go for a 23,000 mAh battery!

  191. Rob M
    April 29, 2014 at 1:48 pm

    I think the optimal charger would be a good combination of stored power and a solar charger that is capable of charging the battery in the charger as well as direct solar charging for your attached device.

  192. Dean
    April 29, 2014 at 1:44 pm

    Bigger is better! More than 20000 mAh!

  193. Terry M
    April 29, 2014 at 1:43 pm

    Something with 5 digits.

  194. Denis K
    April 29, 2014 at 1:41 pm

    Somewhere about ~20000mAh.

  195. chuckzwood
    April 29, 2014 at 1:40 pm

    Bigger is better!! I prefer over 20000 mAh.

  196. Adrian
    April 29, 2014 at 1:37 pm

    23k seems a bit excessive but I'll accept a free unit without issue.

  197. Huzefa Shakir
    April 29, 2014 at 1:02 pm

    The bigger, the better.
    23,000 mAh will do just fine.

  198. Adly A
    April 29, 2014 at 10:34 am

    23, 000 mAh is ok for me.

  199. Philip C
    April 29, 2014 at 10:28 am

    Yes, bigger is better. More than 20000 mAh is preferred. :)

  200. MTC1446
    April 29, 2014 at 9:58 am

    Bigger charge capacity is always better but I think the size of the device matters too but I support bigger charge capacity I have bigger needs :D Lots of bigger going on :D

  201. sun
    April 29, 2014 at 9:31 am

    This is fine. I don't have a tablet just a phone

  202. Saumyakanta S
    April 29, 2014 at 7:23 am

    Its just awesome , and in this case , the bigger the better.

  203. Jo-anne P
    April 29, 2014 at 6:09 am

    for me not less than 20000mAh. i have needs lol

  204. John Darrow
    April 29, 2014 at 6:05 am

    Well, if it could also provide an emergency boost when my wheelchair runs out of juice, that would be great (but probably be WAYYYY too heavy!) Seriously though, being able to extend a tablet by a few hours would ensure being able to get through the day.

  205. Johnna Rhodus
    April 29, 2014 at 4:37 am

    23,000 mAh

  206. Vic L
    April 29, 2014 at 4:00 am

    I'm sure bigger is better. Many of us use not only one device/gadget to this big capacity is enough.

  207. Jim Wood
    April 29, 2014 at 1:43 am

    for heavy use laptops / tablets bigger is needed for road warriors.

  208. Andrew
    April 29, 2014 at 1:01 am

    Bigger is better, but as to the best capacity, that depends on how heavy a battery pack you're willing to carry. This one weighs considerably more than a 10 inch tablet, so it's probably pushing it.

  209. Bienvenido C. Masaluñga Jr.
    April 29, 2014 at 12:55 am

    23,000mAh is pretty nice and I don't have any issue about size, I just wan't to have extra battery charges :)

  210. Divya Mistry
    April 28, 2014 at 9:53 pm

    Bigger capacity is almost always better. The optimal capacity is the capacity that'll bring my phone, tablet, and laptop to full charge after they were fully depleted.

  211. Ben
    April 28, 2014 at 9:42 pm

    Depends on use but most likely for emergency power smaller is better

  212. Keith W
    April 28, 2014 at 8:38 pm

    I don't know but this sounds like a good start.

  213. Dan D
    April 28, 2014 at 7:27 pm

    Yes and OVER 9000!

  214. Va D
    April 28, 2014 at 7:21 pm

    Yes, big is better. As to how much the optimal capacity is, it depends on how large you can get w/o making it too large and bulky.

  215. Daniel V
    April 28, 2014 at 6:54 pm

    Big is good, and not sure about the second question.

  216. Ed
    April 28, 2014 at 6:16 pm

    Can never have enough juice.

  217. Leoner G
    April 28, 2014 at 6:10 pm

    Enough to charge completely your device...

  218. John C
    April 28, 2014 at 4:58 pm

    What most have already stated; never can be big enough.

  219. Stephan H
    April 28, 2014 at 3:57 pm

    As big as possible.

  220. Tex
    April 28, 2014 at 3:56 pm

    Twice whatever you think you think you need ?

  221. James
    April 28, 2014 at 3:06 pm

    I like biggest capacity balanced with portability and lightweight design.

  222. SH
    April 28, 2014 at 2:45 pm

    Depends on the use - the biggest possible for my emergency bug-out bag; a smaller one for regular travel and day to day use.

  223. Wei Lian L
    April 28, 2014 at 2:36 pm

    Bigger capacity is always better but I might think twice about bigger size as a result of the bigger capacity

  224. Dan K
    April 28, 2014 at 2:06 pm

    for me is fine with a 12k battery

  225. Mklopez
    April 28, 2014 at 1:53 pm

    It's never big enough!

  226. zaid Merchant
    April 28, 2014 at 1:32 pm

    NO more charging the portable charger!!!

  227. Nabil Z
    April 28, 2014 at 1:24 pm

    A 9000 mah i think

  228. Cass
    April 28, 2014 at 1:11 pm

    I really have only ever needed 1 extra charge at a time and being able to throw the external charger in my bag without it taking up much space is a plus. This guy is looking a little bulky to me.

  229. Dany B
    April 28, 2014 at 12:51 pm

    In battery capacity bigger is always better.

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