I ran the MaxAmps 11.1V 4000mAh packs yesterday and it didn't perform like the smaller 11.1V 2200mAh packs did. I had to stop at around 8 minutes due to the packs heat and a swelling issue that was uncomfortable to see. The swelling has gone down and they charged ok, but I'll just run them on my Stampede from now on LOL. I will run the KongPower 11.1V 2200mAh today and see the results they give me.