This Varta High Energy 9V PP3 6LR61 alkaline battery is supplied in an original manufacturer's blister 'push out' single pack. These batteries are typically used in smoke alarms and carbon monoxide detectors, presence detectors and computer equipment, along with flashlights, walkie-talkies, some radios and even older electronic scales. Additionally, this size of battery is also used in some alarm clock radios, to supply short-term back-up power and maintain settings during power cuts. The Varta 'High Energy' range is the most powerful from this German manufacturer and offers powerful current for devices with flexible high or moderate energy demands. It is also equally suitable for providing a trickle current for long periods, typically up to one year. With a storage life of several.