9 step 12V / 12.8V 1.25A sealed battery saving charger & maintainer for AGM; GEL & STD 12V batteries from 4 – 60Ah & Lithium (LiFePO4) 12.8/13.2V batteries from 2 – 15Ah. OptiMate 4 Quad Program tests before & after charging and can recover a ‘dead-flat’ lead-acid & lithium (LiFePO4) battery from as low as 0.5 Volts. - Selectable; 4 charge programs: 1).12V Smart desulphation: 0.5V - 14.4V. 2). BMW CAN-bus compatible: 5V - 14.4V. 3). 12.8V Low Volt Recovery: 0.5V - 14.4V. 4). BMW CAN-bus compatible: 8.8V - 14.4V. - Charging Amps: 1.25A (constant current) - Indoor / Outdoor (lowest temperature: -40°F / -40°C) - Save: Low Volt Start of 0.5V + 2-step* desulphation recovery (*1-step low volt pulse save during CAN-bus mode)- For 4 x Lead Acid; AGM & GEL 12V batteries from 3 to 50Ah - Input: Global (100-240V 50-60Hz); high efficiency (CEC listed) - Weatherproof case with wall mounts - Incl. 6ft. / 180cm AC supply lead and 6ft. / 180cm charge lead ending in SAE connector. Weatherproof battery lead; battery clip set & hanging hook - No risk of overcharging - Sparks suppressed - Safe for vehicle electronics - Safe for long-term battery maintenance - Automatic shut-down if short-circuited or battery disconnected.