Check the listing for details. Honda Optimate 1 Duo 12 Volt Battery Charger. Condition: New. Listed at 47.99 USD. The ‘no brainer’ battery maintainer that guarantees healthy lithium or lead-acid batteries! OptiMate 1 DUO, the easy battery maintainer that will get the vehicle’s battery to perform stronger and last longer. This industry leading battery charger with DUO technology automatically charges both 12V lead-acid batteries (AGM, STD, GEL) and 12.8V / 13.2V lithium LFP (LiFePO4) batteries. DUO means EASY! OptiMate 1 DUO senses the battery’s condition and voltage and automatically adapts its charge program to match the battery type. The 24-7 SAFE maintenance program will adjust to what your battery needs. It automatically turn on and off to keep your 12.8V/13.2V LFP lithium battery or 12V lead-acid battery in the perfect condition and extend its life.