Tenergy CR123A batteries are a non-rechargeable lithium cell offering long runtimes in a disposable format. They're suitable for devices such as flashlights, cameras and wireless security systems. Compared to rechargeable lithium cells, non-rechargeable lithium variants possess improved charge retention and remain highly effective in cold temperatures. Rechargeable lithium batteries, on the other hand, often experience capacity reduction in cold weather and lose charge over time in more temperate climates. With minimal charge loss in storage, Tenergy CR123A batteries are ideal for outdoor trips to cold climates and an excellent choice to have "on the shelf" for emergency illumination needs.