i use one of these 7.4v batt's (hobbico yellow starter like above) to start my .47 gms.
http://www.all-battery.com/72v4200ma...umorobots.aspx
with a 40 amp drain rate (4200 mah) these can turn a starter well w/ 7.4v, let alone 14.8 if i were to add another pack

or you could make a pack w/ these (way overdoing it) and power your starter(and everything else) for a month or so (being sarcastic)
http://www.all-battery.com/4pcsfsize...batteries.aspx