I personally use a 5 cell (6v) AAA pack that I made up. They are rated at 50mAh which privides plenty enough power for the whole 8 minutes. I just charge them up before each run which takes about 4-5 minutes (.05amp) and that's it, job done. The switch on the ESC is not used and a second switch on the lead going to the RX from the AAA pack turns the car on and off. Easy!