Li-ion batteries are known for having one of the best energy densities, no memory effect, and a slow loss of charge when not in use. Li-ion batteries are also environmentally safe because there is no free lithium metal. Our batteries are the highest quality batteries you can purchase. This 3500mAh 18650 Li-ion battery is an upgrade from our previous 2600mAh. It is compatible with all Night Eyes lights. 

Capacity: 3500mAh with PCB
Voltage: 3.7V / Dimension: 18650 size 6.5cm x 1.8cm
Type: Samsung rechargeable 18650 Flat Top