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Unique LiFePO4 battery protection! The OptiMate Lithium 0. 8A 4S charges LiFePO4 / LFP (Lithium Iron Phosphate) 4-series batteries with nominal voltage of 12. 8V – 13. 2V! Program steps - STEP1: Low Volt Start (0. 5V). STEP2: Ultra LOW VOLT SAVE. STEP3: LOW VOLT SAVE cell monitoring. STEP4: TEST cell damage. STEP5: Cell-balancing CHARGE. STEP6: OPTIMIZE. STEP7: TEST after CHARGE. STEP8: OptiMate maintenance. Special features: Saves low voltage LiFePO4 batteries Specialized LiFePO4 charge cycle Maintains & protects LiFePO4 batteries Battery BMS reset. 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 .