My setups is a etti 150a yes i know its a boat esc but im just using it for a little while and it works farely well and a feigao 12xl motor. I had a series connector that was wired correctly. After about 5 mins i disconnected the 2200 and then plugged the 4000 in by its self and ran about 10 mins longer the hole time i was checking temps and monitoring cell voltage. The low-voltage indicators plugss into the balancing port to detect cell voltage. Also they are 15c cont. batts.