The battery holder is really small and i doubt it would fit, has anyone ever modifed the battery / car to be able to fit a REGULAR optima (not the really expensive sports car edition(51 i think) of the optima) into my civic? Is this a good buy? My original battery just died (1999-2006, im going to miss it) and i need a replacement and i think the optima deep cycle(yellowtop) is good... Will the default alternator supply the battery? Ideas? Thanks!