This battery is sold by Energizer and it comes in a 9V size. Its voltage is 9V, and its chemistry is lithium. This is a primary battery, and it is taking the place of Energizer's Advanced Lithium line. The shelf life on these cells is 10 years. They are frequently used in carbon monoxide detectors and smoke detectors. They are 1/4 smaller in terms of weight than regular alkaline primary 9Vs. Ultimate Lithium batteries are made in such a way that they do not leak. Have a lifespan 20% longer than other Energizer 9V type, the Max. Able to withstand high and low temperatures of -40 degrees F to 140 degrees F.