We have a stock rustler with a 7cell NiMH & xl-5 esc ..we switched our motor to the Firebolt 15t 540 and a 17t pinion gear. The battery we have doesn't last for more than 10 minutes on a full charge. My sons getting a bit tired of that... I want to switch to LiPo but not sure if we should get a 3s or 2s. I have read the power ratio of the 7cell NiMH is close to a 2s but I wasnt sure if we can get a 3s in case we want to upgrade to brushless later. So, can we run a brushed motor on the 3s or should I just get the 2s to be safe? Whats your opinion on brand and also what charger to get? I've seen this one seems to be popular http://www.ebay.com/itm/150950676972...84.m1436.l2649