Originally Posted by Krio

I ran those exact batteries all summer with my 4.5 turn 550 tekin motor without any issues. They felt warmer than average after dumping one, but never puffed and punch felt fine. Enter the tekin 4000kv 540 4 pole motor and those same packs came off the track warmer than I was comfortable with and one swelled a touch. I have since relegated my gens ace to 2wd and picked up 4 new 5600 mah 50-100C Hard case nano-techs and they come off the track as if I was running a stock buggy: cold.