Why does my laptop battery pack drain when it is plugged in?
Question by uhhill /
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I always run my laptop plugged into power source. Battery life keeps slowly draining anyway. Whe I diconnect & reconnect power source, laptop starts to charge battery for approx 10 sec and then stops charging. Is it my laptop or battery that has a problem?

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Answers (5)
  • Mike

    Although this problem is (almost) solved in current laptops you shouldn’t really work being plugged in all the time. The battery is there for a reason…

    You should either remove the battery (which introduces a whole other problem in case you accidentally disconnect the power) or unplug it at times to drain the battery down to like 20% or so.

    The problem with most laptops is that they don’t bypass the battery while being plugged in which means you drain power and it gets recharged immediately resulting in a low lifetime.

    One thing to consider is that some laptops clock down to slower speeds while running on battery or even turn off a dedicated graphics solution. In that case you should plug it in when you need the power and then unplug it during regular use.

  • Smayonak

    In case you have an IBM (older models in particular), they use a technology that slowly discharges the battery while plugged in. It’s designed to keep the battery from fully charging while cradled. I had an IBM battery last about five years while continuously being plugged in thanks to this innovation.

  • Anonymous

    Measure the voltage with a voltmeter


    Hello, Your battery is almost dead…there is some juice left in it but not enough to do more than turn your laptop on.  It is always recommended that if your battery is completely charged but you rather use it connected to power, to take the battery away.  The surest way of killing a laptop battery is heat.  Anytime, laptops are connected, they create heat and therefore that heat transfer to your battery.  If you are willing to spend 100$+ for an original battery go ahead, you just have to consider if it is worth it for you or not.  Make sure to buy an original though, not some cheap imitation that will not work at all or cause problems after a couple of weeks.

    You can try resetting your battery a little bit.  It all depends on how gone the battery is. 

    — charge laptop until battery is completely charged
    — disconnect power from laptop
    — use laptop with battery until all juice is gone
    — take battery away and press power button for at least 30 seconds
    — connect battery and charge for at least 12 hour
    — use laptop with battery power until juice is gone
    — take battery away and press power button as before
    — charge laptop for at least 12 hours
    — use complete charge

    If you do this for at least three times, you will see an improvement in your battery life.  Like I said, it all depends how gone your battery is.  You will never be able to recover a full charge but you will be able to add on some extra time for laptop when running on batteries.

  • Dave Parrack

    It sounds like your battery needs replacing. Mine does exactly the same thing. It lasts for maybe 5 minutes unplugged and then only recharges up to around 80% again.

    Depending on how much you use your laptop unplugged and how soon you expect to upgrade your hardware it may not be worth replacing your battery at all.

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