OptiMate 3+ is the most advanced fully automatic diagnostic battery optimizer and maintainer for all 12V lead-acid batteries.This includes sealed & conventional batteries for motorcycle and similar vehicles, including dry-charged "MF" & sealed "WET" maintenancefree types, & sealed "deep-cycle" GEL batteries used in back-up power and other applications involving a steady delivery of power. Best for batteries from 2.5Ah to 32 Ampere-hours capacity.