I have a large set of circuits to make using Lithium Ion cells for power. The circuit requires ~12V, which is easily achieved by stacking three cells in series, but the charging circuits I've obtained are little TP4056s which (AFAIK?) can only charge one cell each.
I'd like to avoid having to decouple or remove the batteries for charging, so I thought up the circuit below, basically adding some diodes to separate the cells when they're charging (and the circuit is switched off). I'm basically asking for a sanity check: does adding diodes this way correctly separate the cells? Or am I missing something about how voltage/current will work out, given that all the IN+ and IN– will be paralleled to a 5V supply?