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RE: Battery tinkering
So it's just a li-ion cell with no serial or parallel connection. I figured this out because the battery just had 2 leads one positive and one negative. Be careful with these batteries because they can ignite quite easily but the power bank circuit deals with battery protection. Good post.
Yeah, I wanted to find a dedicated new circuit, preferably smaller because my original idea was to fit it inside a smints tin, but then I remembered this old circuit and figured why not. Thanks for the input!