This 12 volt, 4 amp battery charger has a universal 100-240VAC input. It is automatic and can be left connected indefinitely to the battery without harming it. The charger features a desulfation mode to recondition the battery. It can be used for on-board (internal) applications, and is very small and lightweight.
Battery Defender 12 Volt 4 Amp Battery Charger with Bare Wire Leads
Item #: 1207SR | SPECIAL ORDER - SHIPS IN 2 WEEKS