Duracell CR123A

The CR123A battery is a 3-volt lithium cell prized for its compact size and endurance. With twice the voltage of a standard alkaline battery (3V versus 1.5V) and high energy density, it powers demanding devices in a very small package, which explains its popularity.

It is the go-to format for demanding and security devices: high-output tactical flashlights, home security cameras and video doorbells such as Ring, Nest Cam and Arlo, alarm and smoke detectors, rangefinders and sights, and some professional cameras and flashes. Its lithium chemistry gives it a major edge in extreme temperatures, from severe cold to high heat, where an alkaline battery would fade fast.

This Duracell version benefits from Duralock technology, which guarantees charge retention for up to 10 years without use. That matters for security equipment you install and forget, or for building a reliable spare stock for emergencies. It is sold here in a pack of 2, in its original packaging, and it is trusted by law enforcement, security professionals and photographers for applications where a dead battery is simply not an option.

Note: the single-use CR123A should not be confused with the 16340, a rechargeable lithium-ion battery of the same size that delivers a different voltage (3.6 to 3.7V). Many devices accept either, but check compatibility before switching to a rechargeable, since the higher voltage of the 16340 can damage some equipment. For reliable, maintenance-free power, the Duracell CR123A remains a safe bet.