Protects against reverse polarity, short circuit, open circuit, spark proof, overheat, over current and overcharge. High frequency, high efficiency inverter for lightweight, compact charger. Returns to last selected mode when restarted. Interchangeable connectors for easy accessory changes. Safely charges Wet, Gel, MF, EFB & AGM lead acid batteries in addition to Lithium Ion. Repair step for damaged batteries.