I have a charge & a drain circuit connected to a Li-ion cell. As only one circuit can be connected to the cell at a time, I believe I need some diodes. My questions are about when the drain circuit is on and the charge circuit is off.
(In the pic attached, charge circuit on the right, drain circuit on the left.)
As far as i can work out, I only need one diode stopping the battery current flowing back into the charger. Is this correct or are some required at the negative side too?