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  • Are the 3 cells wired up in a pack, so in series? That makes life harder.

    If they're separate (or can be separate) then I'd just use 3 MAX1555 chips.

    In fact if you're not trying to get the charger to be small and you do have cells in series I'd consider just buying 2 isolated DC-DC converter modules and powering the MAX1555 chips through those. Nice and easy, and safe :)

    But yeah, a nice little multi-cell LiPo charger board would be great. I wonder how many people would be interested. My wish list was:

    • Charges 3 cells, maybe 4.
    • Small enough to fit inside the battery pack
    • Charge via Micro-USB
    • A button and RGB charge status LED
    • Potentially a FET-switched output that could be turned on and off via the button - so if you wanted to make (for example) a torch, you could easily get a 'soft' on/off button.

    The implications of it going wrong do worry me, although if all the LiPos have some kind of protection in them now then I guess it's not as bad.

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