I have been running my revo with a mamba 5700/sv2 on stock 6 cell batteries till my lipo charger gets here today. The batteries get EXTREAMLY hot. You can hold them but they are very warm. IS this common with the little batteries? The motor and speed controller aren't too hot after 1-2 batteries, just the batteries are.

I will spend most if not all of my time running the lipos when I get the charger but was curious.