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  • @tage, thanks! that's really interesting - I had no idea about the PTC disc!

    @DrAzzy I actually really wanted to make a board to do it, but I don't really have the time at the moment. I figured for 3/4 cells you could just use Opto-isolators for cell balancing.

    @d0773d The MAX1555 has a charge status output - literally just on/off, but I think it charges at 100mA (or 500, depending on the setup) so you could get a rough idea of capacity by measuring the charge time.

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