I am trying to build 3S and 2S compatible battery charger. I have these TP4056 single cell battery charger modules. But i can't understand how to build it. I see its possible to charge batteries in series but i don't know how to handle balancer socket.
I build 3S battery pack and balancer socket like this
And TP4056 Modules like this
But ended up with over voltage levels, obviously first charger gets 3S voltage second 2S voltage third charger 1 voltage.
Modules Battery GNDs and Supply Voltage GNDs common this is the problem i think.
I think i found what i am doing it wrong. Charger Modules' GNDs need to be separate. I can do that, but then i will need 3 separate power source, can it done with just 1 power source?