I don't think it's so much an issue with the charger as it is my setup. Both batteries are plugged into the same RX. Not the same channel, just the same receiver. If I'm charging the batteries on the linked channels of the charger, say, a & c, if I stop one from charging, you can see a momentary voltage spike in the other one, and then yes, it will stop. This seems to be a thing in the way the charger is programmed, but not necessarily a problem. All I have to do is not charge batteries of the same system on two linked charger channels. When I talked to support at Hitec, they verified and agreed.