You shouldn't try to charge them like that. The way you have them hooked up is in series. Unhook the leads and hook it to single battery. Positive to positive and negative to negative. Make sure the balance lead is plugged in and hooked to charger.
You will charge at 5 amps @ 7.4 volts.

Just to verify, each battery says this on the label right??
Batteries are venom power 7.4V 5000mah 35c 2s2p