So im attempting to make a charger that can charge 2s li-ion cells, the problem is this,

They will be inside of a speaker dock so the normal charging isnt something that i want to do.

So i thought about how laptops are charged, this is exactly what i want to do with the dock, but i wanted to research get some advice etc before hand.

This is what i have setup so fair in terms fo being able to charge them,





Problem is im pretty certain that if that switch isnt flicked it will only charge one battery...so advice is needed on either a better setup or a way i can do it, thanks!