PURPOSE BUILT Specifically designed for the EOTech XPS/EXPS, the Veiled Innovations Battery Conversion Cap (BCC-XE) replaces the standard cap and greatly extends the battery life of your optic with the use of an ER14505 battery. UPGRADED BATTERY LIFE The BCC-XE combined with the 2700mAh ER14505 battery offers SIX times the battery life compared to 450mAh rechargeable CR123's. Battery life DOUBLES when compared to off the shelf non-rechargeable CR123's. SIMPLE AND USER FRIENDLY Your BCC-XE will come with a permanently lubricated o-ring and replacement tether, ensuring zero loss in water resistance and securing the cap to your optic. Simply remove the original cap and CR123, disconnect the original tether, screw on your new BCC-XE with a fresh ER14505 battery, crimp on the replacement tether with any pair of pliers, and head to the range. COMPATIBLE WITH EOTech XPS2, EXPS2, XPS3, EXPS3 PRODUCT INCLUDES BCC-XE (Battery Conversion Cap for EOTech XPS/EXPS), Permanently Lubricated O-ring, Replacement Tether ER14505 battery sold separately