I know this has probably been asked hundreds of times but the best options out there change all the time so it's worth asking again I hope. Anyway, I have a ERBE with stock motor and ESC, I currently run a set of Thunderpower 5200 2S 50C which I get about 50 minutes of drive time on the track without pushing it too hard. Great batteries, I love them. Anyway, I'm looking for a second set of lipo's so that I can stay at the track a little longer and was looking for some recommendations. I don't want to fork out another $250 like I did for the Thunderpowers, I also want to stick to the 2S. I saw some cheap brands out there but the 20-30 'C' rating seemed a little low. What do you guys recommend?