hobby king has 6600 70c 2 cell 45.00 plus shipping and waiting and wondering when its going to get here. or you can get local... Pro match batteries has great 6000 60 c's for heavy trucks, are great batteries and are warrantied, local, and you can get em in two to three days. Jeff's great to work with and answers your questions if you need help. pro tec at a-main has good batteries. notro house.. gens ace 5000 50 C if there in stock and about 5 other hobby store brands. there all good. if you treat them right and don't puff them ..