I have one of my batteries getting real hot and the other stays very cool... I running two 2s batteries and this just started happening.

The truck runs fine for about 2 minutes then slows down.... Gets full power again for about 20 seconds and again power loss.

I have this happen with two sets of batteries (4 ea). So before I start replacing connectors etc, any suggestions?

The voltage in all batteries read with in .04 volts and not fully discharged. Just the battery on the r/h side each time gets very hot!!!!