if you decide to run lipo batteries make sure you have a Low Voltage cutoff module inline so the cells don't fall below 3 volts.. This will damage a LiPo battery.. Any good new ESC's that's made to use with LiPo batteries should have the Low Voltage cuttoff already built into the circuit.. If not, make sure to add one or else you'll have a damaged lipo on your hands that can potential for a fire..

If you EVER notice them start to swell discard of the battery properly... DO NOT throw LiPo batteries in the garbage.. Fill up a large container or bucket with heavily Salted water and let the battery sit in the salt water for at least 6-8 hours .. Then you can discard of the battery..

Might sound ridiculous but believe me, following these precautions can save you alot of problems...