I was wondering .Does anyone have any idea for balance charging 7.4v li-po cells ? I would like to do a mod like this but cant think of a way to balance charge them without a external hobby charger. I would like to keep it internal and balance charge from a usb wallwart. A 3.7v li-po would be simple to add a usb charge circuit internally but im using a stepdown regulator so i need a 7.4 lipo.
My prime choice would be finding a way to make a balance circuit internally ran off a usb wall adaptor
Second option although id rather not have to do it is have it charge in parallel and have a switch back to series.
last option would be to find a small cheap external balance charger thats accurate and have balance charge ports on the mod. This is last resort since i would only be able to charge if i had the balance charger.
On another note for single batt mods i will go with this wall adaptor
and a internal 1A usb charge circuit.