Panasonic CR2 Lithium batteries combine lightweight material with lithium technology to create a power source suitable for golf laser rangefinders. They have high capacity and low internal resistance to provide rapid energy they also have a long shelf life of up to 9 years. BUSHNELL PANASONIC CR2 LITHIUM GOLF LASER BATTERY FEATURES: It Fits Bushnell Golf lasers High-quality Lithium battery Long life battery lasts longer 7 x More power than alkaline