Replacement batteries for your laser cartridges; This battery pack is compatible with ALL SureStrike cartridges excluding the Makarov; Batteries less then 4V will not activate the laser properly and need to be replaced; Nominal Voltage: 1.50V (each battery), 4.5V for battery pack; Standard Capacity: 27mAh (continuously discharge at 20 +/-2 degrees under 22kOm to 0.9V end-point voltage); Approximate Weight: 1.15g; The battery pack purchase includes: 3 packs of LR726 batteries, shrink wrapped for ease of use; Note: Do NOT remove shrink wrap - shrink wrap is to remain on upon installation into your laser