EOTech EXPS3-4 NIGHT VISION Compatible Holographic Weapon Sight, Single CR123 battery with AR223 Ballistic reticle specific to .223 caliber munition - Dana Safety Supply
Marsell CR123A (non-rechargeable) Lithium Battery - 3V 1500mAh Replacement for Eotech XPS3-1 battery -10 Year Shelf-Life (qty of 1) - Walmart.com