No need to worry about LiPo's these days. That was a concern maybe 10yrs ago, but today's LiPOs are high-tech purposely made with rc in mind. They are as safe as regular 6 cell, and will never get as hot as 6 cells, dont need to be discaharged, ever, and can be charged time after time. They have much lower resistance and will not catch on fire unless you BBQ them. Everyone is doing LIPO's, and according to ROAR staff, they will be mainstream within 2 yrs and make 6 cell racing a thing of the past. They are only working on reconfiguring the voltage from 7.4v to 7.2v or less.