this post was submitted on 15 Apr 2025
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I just remembered something - often (and more likely the older the device is) - the battery consists of an array of standard cells which can be bought separately. So if you feel adventurous you can pry the battery open, unsolder the cells, test each one separately - chances are there's just one that's completely dead, thus making the whole thing unusable.
With a bench power supply (or a similar ghetto version, that is any lion charger plus leads) you can charge single cells even while they're connected in series. That's how battery balancing works
I'd start with very low amps and maybe low voltages too to revive them
I remember hearing that you can’t solder batteries normally though and that a special technique is needed to heat them minimally. Is this true?
De-soldering should be ok to start with. Yes, I have heard that too. I'm guessing the "special technique" just means that you make sure the battery does not get too hot. Special tin might be required (that melts earlier).