Package Includes: 1-Pack Battery. Product Description: Kastar High Quality Battery: 1. High Capacity: Kastar super high capacity battery will power your flashlight / headlamp for much longer. 2. Specification: Battery Type: Lithium-ion; Battery Voltage: 3.7V; Battery Capacity: 2600mAh 9.36Wh. 3. 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. 4. 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 flashlight / headlamp. Compatible with: 1. Compatible with battery models: Streamlight 74175 Li-ion Battery 2. Compatible with these Streamlight flashlights and headlamps: Strion Switchblade Strion LED FlashlightStrion LED HL Flashlight Strion HPL Flashlight Strion DS HPL FlashlightStrion DS HL Flashlight ProTac HL USB FlashlightProTac HL USB FlashlightProTac HL USB Headlamp Twin-Task USB headlamp Notice: If any questions, please feel free to contact us, our friendly and hassle-free customer service will work hard to put a smile on your face.Thank you very much!