OptiMate Lithium LFP 4s 0.8A Quad BankOptiMate Lithium 4s 0.8A Quad Bank LITHIUM series: 8-step 12.8V 0.8A sealed battery saving charger & maintainer x4.The ideal choice for up to 4 x 12.8V/13.2V LifePO4 / LFP Lithium batteries. Dealer / battery resellers’ choice!deal for 4x 12.8V/13.2V LiFePO4 / LFP batteries.Charge banks are electrically isolated from each other and operate independently. Charge batteries separately or charge batteries connected in series!BMS re-activates battery from sleep or deep discharge protection mode.Fully automatic multi-step program brings the battery safely to full charge. Connect to the battery and OptiMate Lithium 4s 0.8A Quad Bank does the rest, no supervision required!Safe to leave connected. Full electronic protection.24/7: Maintains battery at full charge and good health.Low voltage recovery from as low as 0.5V.S.O.H.: Tests battery state of health.TEST: Warns when battery damage is detected.Green Technology: Energy saving technology. Stand-by power less than 0.5W and Efficient 24-7 battery maintenance.IP54: Weatherproof. Rated for use down to -40°C / -40°F.8-step 12.8V 0.8A sealed battery saving charger & maintainer x4