Robot crap

So I’m having trouble coming up with an economical battery solution for my KILLER ROBOT. I’d like to use Lithium Ion tool batteries, as they offer dramatically better performance than traditional batteries, but (a) they’re expensive and (b) they need expensive charging hardware. this purports to be a relatively cheap homebrew charging circuit for a li-ion battery, with the caveat that it only works for batteries still holding some charge, and may or may not (I’m too inexpert to tell) be easy to adapt to different sizes of battery. Still, it’s a possibility.

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