since I don't have a battery sponsor I budget shop Lipos. Turnigy batteries are an awesome value and you can get the a spec or standard 4200Mah shorties for like 38$ each. There in stock at the moment at the American warehouse also. I just got this pair of intellect shorties from Pro Match RACING. They are less then 50$ each also. Can't go wrong with either of them IMO. If money's no object I'd get the ProTek 100c packs from A main with the 5mm bullets or the new Trinity formula X packs. They are both in the $100 piece range.