Streamlight ProTac, Flashlight, Multi-Fuel, 500 Lumens, Uses Streamlight SL-B26 Protected Li-Ion USB Rechargeable Battery Pack or (2) Two CR123A Lithium Batteries, Black, Includes (2) CR123A Batteries 88062 The 500 lumen ProTac 2L-X is an EDC light that is available two ways: The ProTac 2L-X USB is a complete rechargeable system that uses their new Streamlight SL-B26 protected Li-Ion USB rechargeable battery pack with an integrated USB charge port. This ProTac 2L-X includes two CR123A lithium batteries.