davedarko[2018-10-03] Turns out my schematics were bad and basically shortened one battery when in "use" setting. The after math: one LiPo is trash, as well as the charger. Today I've rebuild the charger with normal TP4056 modules, no protection and strictly followed the tutorial.
[2017-06-18] next maker faire this thing needs to roll around and move the head and stuff. SO I needed a power bank. I wanted it to be a 2 cell battery, that is also balance charged. https://learn.adafruit.com/multi-cell-lipo-charging/fast-multi-cell-charger my schematics are a bit different, but the general concept is the same. Micro USB is all the rage to charge stuff, but mounting can be quite a challenge, so I went with a USB B plug. I've used two classic TP4056 modules with onboard protection (TE420) and a voltmeter. Bye bye weekend, but totally worth it!
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I like the simple hack for charging them with 1S lipo chargers. Finding chips that can charge 2S lipos is a so much of a challenge, that I simple switched to 1S lipos everywhere.
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one of the batteries seems to charge very slowly and gets very warm. it might just be a dead battery, since I'm recycling etc. but I need to check the schematics again, to be sure. I'm at 7.7V for the last 2-3 hours. meh.
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I suppose that explains that... Sorry for that.
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What is the capacity / which cells did you use?
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each have 2150mAh - Coslight LiPo CA603696. They're from a netbook that I had, I think it was the msi "macbook air" clone.
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seems like they're too big for the TP4056, I thought it checks the voltage to know when to stop, but it seems more likely that it thinks that my batteries are 1000mAh instead of 2150mAh. weird. weid. weird. it stops charging at 3.8V
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