need some expert battery advise

[DwightSchrute]

i'm not using an external BEC, it's a V3 MMM. I don't charge them as one pack though, i hadn't thought about that...does that make a difference? can i charge it as a 6S using the series adapter? how would i balance them then? they only have 3S taps.

Also, i'm going to make another series connector to be on the safe side, it always seems to be the pack on the right side that drains so much faster than the other. keep the ideas flowin guys, any help is greatly appreciated.