Lithium Batterys require specific Lithium Battery Chargers for safe and effective charging. OptiMate Lithium LFP Select is perfect for high performance 12.8V (4s) and 16V (5s) LiFePO4 / LFP batteries that demand fully automatic, fast and accurate temperature controlled charging. Perfect for 12.8V / 16V LiFePO4 / LFP batteries sized from 2.5 to 200 Ah.With Optimate Lithium's Battery SAVE mode with BMS reset charging starts from 0.5V with continuous monitoring and testing of charge acceptance or bad / shorted cell condition. Unnecessary (and unsafe) charging of a bad battery is prevented. Lithium batterys are saved from damage as reduced charging power is used at low temperatures and even stoped if the temperature is below -20°C (-°F). The onboard Microprocessor adjusts the current to the ideal LiFePO4 charge curve to match battery size / condition, for fastest and most complete charge.