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Cost-effective 12V battery maintenance! OptiMate 1 delivers precise micro processor controlled charging & long term maintenance. Maintain any12 volt lead-acid battery, sealed AGM (MF) or GEL! Program steps - STEP1: Low Volt Start (from 4V). STEP2: CHARGE. STEP3: OPTIMIZE. STEP4: OptiMate ‘365’ Maintenance. Ideal for vehicles that are seldom or seasonally used, or in storage. The OptiMate maintenance program delivers only what the battery needs, never overcharges, never undercharges. SAFE: No risk of overcharging. Totally safe for vehicle electronics. Sparks suppressed. Safe for long-term battery maintenance. Automatic shut-down if short-circuited or battery disconnected. 3-year limited replacement warranty.