12 pack of Tenergy 9V Alkaline batteries are designed to deliver high performance and reliability. Provides long-lasting power in a wide range of devices: smoke/fire detectors, guitar pickups, microphone, cameras, and much more. Trusted to operate in temperatures of -4 to 129 degrees Fahrenheit. Batteries are date coded to guarantee freshness for everyday uses or for storage. Alkaline batteries are one-time use and non-rechargeable. Please DO NOT recharge these batteries.