Mentioned some time ago about the 500i scooters that the batteries are too small and I had paralleled a lawn and garden battery to solve my starting problems in the UXV500i side-by-side. That arrangement finally quit the other day so a new battery arrangement was made. Since the OEM battery was 175 cold cranking amps, I opted for a 320 cca mower battery for 40 bucks. Big savings over using a Yuasa quality unit for way more money. There is plenty of room under hood for this thing and it has NO problem spinning the big thumper over.