LaserMax Laser Batteries - LMS319 for guide rod lasers that fit GLOCK 26, 27, 29, 30, 33, 36, 39; SiG P239, P245 and Springfield XD 3 inch Sub-Compact, 4 inch .45ACP. This battery type is Silver Oxide and has a power output of 1.5 volts. Shelf Life is approximated at 5 years. The LaserMax laser Batteries come in 1 shrink-wrapped set of 4 batteries.