Venom rc 11.1. Volt 35 c lipopolymer batteries in 1350 mah form after a year. Plus of bashing hard i had a issue with a pair of radio control rc lipo polymer batteries so i contacted thier website... It had easy warranty claim form. They reply quickly and they replaced them for nothing EVEN THOUGH they were way over a year old and had serviced me beyond expectations. I was only expecting the lifetime replacement charge of 30 % off. But these folks. Straight up just said no worries and free of cost shipped them to me... i have bought other items from atomik with same quality in thier. Brushless motors and speed controls. So if you like great items, best of warranty service, and usa located customer service that goes the distance to keep me playing with my fastest of electric cars trucks and buggies VENOM BATTERIES BY ATOMIK RC BUY THE BEST BE THE FASTEST GO TEAM ATOMIK