High Capacity: No longer to worry about the endurance of the batteries, Kastar high capacity battery will provide ultra strong power for your flashlight / headlamp to performance well and operate longer. Battery Specification: Battery Type: Lithium-ion; Battery Voltage: 3.6V; Battery Capacity: 2600mAh; Battery Dimensions: 70.3 x 20.6 x20.6 mm (2.77' x 0.81' x 0.81'). Safe to Use: Kastar lithium-ion battery cells meets UL1642 & CE safety standards to ensure that your battery pack will be safe to use as a replacement for your unit. Comes with built-in over-charge, over-discharge, over-voltage, over-current, and over-heating protection circuit. Save Money & Time: Do not spend too much time and money on frequent brands with low quality replacement. With our longer run time & protection features, your cycle life will also be improved because you get quality product for your device.