What's the best way to charge 4S 18650's in a light?

Batteries and Chargers Chargers
1

What’s the best way to charge 4S 18650’s in a light? Preferably with Micro USB. Any way to charge them in parallel even though they’re wired in series? Like connect separate wires to each battery and have 4 separate TP4056’s? Or is there a better way to do this?

Space shouldn’t be much of an issue, but they will be difficult to access so charging in the light would be ideal.

2

I would use 4 TP4056, but from the same batch so they would balancing quite well.
Balancing board from a lipo hobby charger would do it too, I think you can buy some spare balancing boards from BG for 2S 3S 4S whatever S too