I'm having a hard time grasping the concept of using a mosfet as a relay. I don't have a schematic yet because I can't figure out what the circuit needs to be.
Here's what I'm trying to do:
I have (3) 18650 Li-Ion Batteries and (1) TP4056 charging module. I need the batteries to be connected in series when they're actively powering the load. Then I need to disconnect the load from the batteries and charge them via the TP4056 which they need to be in parallel for. Or I can use 3 individual chargers for each individual battery. Would the Mosfet go between each battery and the TP4056?
Any help, ideas or suggestions would be appreciated!