The ultimate battery charger for 12. 8V (4s) & 16V (5s) LiFePO4 / LFP batteries! OptiMate Lithium LFP Select is perfect for high performance batteries that demand, auto-fast, temp. controlled charging! 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. Perfect for 12. 8V / 16V LiFePO4 / LFP batteries sized from 2. 5 to 200 Ah. Power saving stand-by mode. Full electronic protection against errorsSpecial 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. safeTº : Automatic charge rate adjustment to ambient temperature sensed at the charger. Reduced charging below freezing, no charging if temperature is below -20ºC/-4ºF (can damage lithium batteries). Ampmatic : Microprocessor adjusts current to ideal LiFePO4 charge curve to match battery size / condition, for fastest and most complete charge. Protection against incorrect voltage selection : With 16V selected and a 12. 8V (4s) battery is connected OptiMate 7 LFP Select will immediately warn that a low voltage is sensed and then not proceed to charging. USER must confirm the nominal voltage of the connected battery is 16V (5s) before SAVE mode activates. During SAVE mode the charge curve is tracked, if the battery appears to be less than a 5-series 16V battery, it will stop charging. 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 .