Program steps - STEP1: Low Volt Start (0. 5V). STEP2: TEST before charge. STEP3: Temperature check. STEP4: Ultra LOW VOLT SAVE. STEP5: LOW VOLT SAVE / cell monitoring. STEP6: TEST - cell damage. STEP7: Cell-balancing CHARGE. STEP8: OPTIMIZE. STEP9: TEST after CHARGE. STEP10: OptiMate Maintenance. Special features: Battery SAVE mode with BMS reset : Starts from 0. 5V with continuous monitoring / testing of charge acceptance or bad / shorted cell condition. Unnecessary (and unsafe) charging of a bad battery is prevented. Safety : Automatic charge rate adjustment to ambient temperature sensed at the charger. Reduced charging below freezing, no charging if temperature is below -20C/-4F (can damage lithium batteries). Amp Matic : Microprocessor adjusts current to ideal LiFePO4 charge curve to match battery size / condition, for fastest and most complete charge. 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 .