The Antigravity ATZ-7-RS is a hi-power lightweight Lithium-Ion battery, weighing 1.3 lbs., built with our groundbreaking RESTART Technology (built-in jump-starting) so you won't ever get stranded with a dead battery again! Directly replaces the OEM YTZ7S, YTZ5 and others. Most off-road bikes use this size as well as some street bikes