I now have two batteries and have run into a weird issue when trying to parallel charge them both at once.
When I plug them into the parallel board & turn them on, the one with higher voltage starts to charge the other battery. When I put out 10A from the charger, the batteries alternate between charging, not at the same time (maybe they are both charging at the same time, but it alternates between the battery with the LEDs loading bars to indicate charging, so I can't be sure.) Maybe I will post a video later to illustrate what I mean.
Since they are alternating between charging, one of the batteries will stop charging when close to full, this is the same behavior when you are close to full voltage with the standard DJI charger and turn off the battery, it won't auto-detect that it isn't completely full & you must turn the battery on to fully charge it.
Quite annoying this, obviously I'd like to be able to charge them both at the same time without the batteries interacting with eachother, anyone have any tips?