Rechargeable High-bright and saving energy Automatic Emergency Lamp. Light Sources: 8pcs 0.2W LED Built-in Battery: Sealed lead Acid rechargeable battery : 6V4AH Charging Time: 20-24 Hrs Performance Time (At full charge): 25 Hours (For the 8pcs 0.2W LED)This Akko lamp shade illuminates the whole room, has a very long life and lights for upto 18 hours at full charge. It has a 6V  built in battery that can be replaced after several years of service. When connected to charge and still on, it lights up automatically. It has overcharge protection. If not used for more than 3 months, drain the battery and charge it to full. This will ensure a long battery life.