Check the listing for details. Optimate 1 Duo. Condition: New. Listed at 72.53 USD. OptiMate 1 Duo features precise microprocessor controlled charging and long term maintenance. Maintain any type of 12V lead-acid battery, STD (filler cap), AGM and GEL and 12.8V/13.2V lithium (LiFePO4) batteries without overcharging. The OptiMate maintenance program delivers only what the battery needs, never overcharges, never undercharges. • For all 12V powersport battery types including STD, AGM and GEL and Li-on made with LiFePO4 / LFP technology IDEAL FOR: AGM, GEL & STD 12V batteries & Lithium (LiFePO4) 12.8/13.2V batteries from 2 – 20Ah FEATURES: Low Volt Start step adjusts charge parameters to match battery type; 24-7 safe long term maintenance. SAFE: No risk of overcharging. Totally safe for vehicle electronics. Sparks suppressed. Safe for long-term battery maintenance. Automatic.