They keep going, and going, and going. Uses: Longest lasting AAA battery in high-tech devices. Lasts up to 7x longer in digital cameras (vs. ordinary alkaline). 33% lighter than alkaline. Performs even in extreme temperatures: -40 degrees F to 140 degrees F. For: digital cameras, CD players, handheld games, two-way radios, photo equipment. Contains: 4 AA batteries.