These professional packs of Energizer Ultimate Lithium 9v batteries are exactly the same as their retail packed version. The pro packs just make it easier for engineers and installers replacing batteries. These 9V lithium batteries are long lasting and keep your essentials powered up. Commonly used in smoke detectors, doorbells, games consoles, torches and more of your everyday devices. These Energizer lithium 9V batteries boast up to 10 years’ shelf life in storage and tolerate extreme temperatures, from -40°C to 60°C, for year-round indoor and outdoor use