This is what was going to go up yesterday… but was delayed by my venting.

Today I’m taking apart a battery that refuses to hold a charge. I’m trying not to have this be a destructive teardown since I want to be able to rebuild this battery pack (along with its brother that’s only a bit less janky).

All it takes is a Torx-10 driver and a knife to cut the heat-shrink.

Interestingly, the pack is nothing more than a bunch of sub-batteries all wired together. 12 1.2V NiCd batteries all wired in series!

This brings up an interesting topic: battery sizes. I’ll give you a hint, there’s a lot more than the AAA, AA, C, D and 9V batteries out there in the world! :-D

This is a 22.6mmx40.9mm battery. The 22.6mm width is essentially a 23mm sub-C battery of some sort. The 41mm width is a bit more puzzling. It’s a bit shorter than a normal sub-C battery, but … well … that’s the closest size.

I think what I’ll do is get two-dozen batteries and wire up a pack and report back. The cost new for a new battery pack is around $50. I’m figuring around $15 worth of batteries will get me something better than new!

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