So my son used some of his birthday money and bought a Fury 2wd 1/10th scale short course truck, and I'm looking to buy him some spare batteries for Christmas. I'm sure this has been asked 1 million times, but searching for these topics only confuse me more as I don't know much about R/C cars. Looking for longer run times and shorter charge times. I think it came stock with a 2000mA battery. Any recommendations are appreciated.