Streamlight 88136 Rechargeable Lithium Polymer Battery Pack Rechargeable Lithium Polymer Battery Pack The Streamlight 88136 battery pack is made to make the ProTac 2AA-X USB as powerful it can be. The Lithium-Polymer rechargeable battery pack powers your ProTac 2AA-X to produce 550 lumens and 10,250 candela while lasting anywhere from 2.25 to 16 hours. The battery pack is also equipped with on-board safety control in its circuit for added protection. USB-C Charging The Streamlight 88136 battery pack is integrated with a USB-C charging port for easy connection to wall outlets, power banks, and computers. A 1600mAh Lithium-Polymer battery provides a long runtime. You can recharge up to 500 times providing the power equivalent of 1,000 AA alkaline batteries. 4-hour charge times means this battery pack is rechargeable between uses. The power of this battery will provide you with all the runtime needed to complete your activity.