High-performance lithium battery 3,500 Wh; Energy power density to 138 Wh / kg; Weight is just 25.3 kilograms; 12 hours to fully recharge with the standard 350 watt charger; Optional 1700 watt fast charger recharges under 2 hours; Waterproof to IP67; Including battery management system with integrated protection against overcharging, short circuit, deep discharge, polarity reversal, overheating and submersion.