It’s time to power up your super bright X75. This upgraded power source nearly doubles the runtime of your favorite flashlight! The Acebeam X75-BP8 (8 pieces 21700 Li-ion rechargeable batteries) pack is a dedicated large-capacity replacement battery pack for the X75 searchlight. This battery pack comes with a built-in USB-C charging port for quickly charging anywhere you go. Plus, the battery pack can function as a power bank for charging up cell phones without a traditional power source like an outlet.