The Ultralife lithium 9-volt battery is a consumer-replaceable battery that lasts up to 5 times longer than ordinary alkaline 9V batteries and 10 times longer than carbon-zinc batteries. This primary battery has the highest energy density, flattest discharge voltage curve, longest shelf life, widest operating temperature range, and lightest weight of any comparable 9-volt battery. A 10-year service life makes the Ultralife lithium 9-volt battery the choice for major smoke alarm manufacturers for their premium lines of 10-year ionization-type smoke alarms. And as a consumer-replaceable battery, consumers can instantly upgrade their smoke alarms, too. The UL-recognized Ultralife 9-volt lithium battery contains no mercury, lead or cadmium and has a patented safety mechanism. These batteries are ideal for OEM applications, including medical, wireless security, safety, and industrial uses, or as a consumer-replacement battery in 9-volt devices for home safety, music/audio, and recreation.