A fully automatic, 5 step charger that supplies up to 20A of power to any 12V lead-acid or lithium (LiFePO4, Li-Fe, Li-iron, LFP) service battery from 40 300Ah Selectable charge algorithms for AGM (14.4V or 14.7V) and lithium batteries and can use power through its dual input from alternator, solar panel and wind power. When the service battery is fully charged, the D250SE battery charger will automatically redirect maintenance charge power to the starter battery. Maintains a stable output up to 20A to vehicles fitted with smart ECU controlled alternators and also has a temperature sensor for optimized charging. Battery separation replacing diodes and VSR relays. Splash and dust proof (IP65). Compatible with Smartpass 120 (12V) DC-DC Power Management Solution - by CTEK for the ultimate 140A power management solution. Supplied with a 2-year warranty.