Comes with 2 × battery exchangeable and with power supply replacement battery included. Uses 80% less energy than conventional lamps. Bright light instantly. Replaceable lithium-ion battery, charging time approx. 4 hrs. USB charger connection for devices with USB charging cables, such as smart phones, MP3 players, navigation systems etc. Housing made of die-cast aluminium and high-grade plastic. Rechargeable battery: 11,1V / 4400 mAh. Equipped with integrated overcharge and total discharge protection and charge indicator.