whitch is a good battery brand and number to get the longest run time out of. also looking for a good price . i seem to run out of my battery after like ten min. of runnig it hard that sucks. i have a 2000 and a 1500 . i know that those are a small number compared to the 3200 and the 3800 but where can i get the best price at? i need a 7.2 v .