I've got a related question to the RoverC and JoyC and charging the built-in batteries.
Am I correct in assuming the external cells are connected in parallel with the internal cells in the M5StickC?
Would that not create an unsafe situation when one of the cells is charged fully while the other is depleted and then connected together? The two cells would then balance at a very high current that may be too high (especially for the small 80mah internal cell)?
Asking this because the charging circuit documentation is still not released, and for all I know the AXP supports only a single cell so they must be connected in parallel somehow.
Also, another concern I have is that the code of the RoverC instructs the AXP192 to up the charging current to 600ma, but it seems like it will also do this when it isn't connected to the RoverC at all, which means the internal cell would be charged way too quickly.