I have 2 2s flightpowers and I want to charge them at once, so put them in series. When I look at the balance tap for the battery, there are 3 red and 1 black wire....it doesn't make sense to me and I'm wondering why there are so many wires. Shouldn't there only be 2 red and 1 black wire? Has anyone charged these in series using a LBA10 balancer?