The XTAR D26 WHALE is a high-performance 2600mAh 3.7V Li-Ion rechargeable battery specifically designed for high-drain electronic devices. It is the most powerful and longest lasting battery of its kind, with an output of 5.2V and an astounding capacity of 2600mAh. The XTAR D26 WHALE has an innovative design that includes a built-in USB port, a battery level indicator, a smart protection system, and a wide range of safety features. The battery is certified by CE and RoHS for safe operation and is capable of up to 500 charge cycles. The D26 WHALE is perfect for powering LED flashlights, vaporizers, and other high-end electronic devices.