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How to fix your dud laptop battery – in one simple lesson


This short video gives an excellent tutorial on how to fix a dud laptop battery. The footage assumes you have a battery which contains standard Lithium cells which can be easily replaced with a minimum of soldering, so if your machine doesn’t, you’re probably best advised to go out and just buy a new battery if you can afford it.


It never occurred to me that laptop batteries would contain easily replaceable cells (duh) so this is really interesting. Of course you’ll need to be proficient enough to use a soldering iron and MOST IMPORTANT –  DO NOT do this if you are in any way uncertain as to how to to wire together circuits and stuff. Lithium battery cells have a tendency to explode if mistreated, overheated etc, so IF IN DOUBT –  DON’T DO IT!

There, have I put the warning strong enough for you?

 Dead laptop battery? Don’t buy a new one…hack the old one! I’ll show you how!


  • I hope he shows you how to stuff it back into the case, I guessing that would be hard to get onto a plane.

    • No, the idea is you take the cells out of the plastic holder, replace them, and re-assemble. It ends up looking just like the original.

  • PLEASE be VERY careful when you do this. That little circuit board in the picture is a thermistor strip. Damage it and if the batteries overheat, look out! Also if you buy batteries to replace your old ones, try to find a supplier that sends you a somewhat matched set.
    If the impedance on all of the batteries does not match, one may charge faster than the others, resulting in an overheat, or explosion.
    Yeah, it can be done, I've done it several times, but please be careful.

  • i have 2 questions:
    1 – that's true that bateries have a limited(by company and not naturaly) the cycle time?
    2 – how can i see the volts and other important things(sorry said only volts, but my english is limited).

    • I think you'll find that most limitations on battery cycle time (I assume you mean recharge time and not battery lifetime?) are put in place by manufacturers as a safety precaution.

      To read off volts and other stats you'll need to buy a multimeter.

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