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9V Batteries

The 9V battery, often called a PP3, is the rectangular cell with the two clip terminals on top. It powers smoke alarms, carbon monoxide detectors, radios, guitar effects pedals and test meters. Our 9V range covers everyday alkaline, with a few rechargeable options, so you can keep safety devices running and top up the tools you use often.

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What 9V batteries power

The 9V PP3 is a familiar sight in the home and workshop. It is the standard cell for smoke and carbon monoxide alarms, where a fresh battery is a yearly safety habit, and it also runs radios, wireless microphones, guitar pedals and electronic test equipment.

Alkaline or rechargeable

Alkaline 9V cells store well and are the sensible choice for alarms and standby use. Rechargeable 9V cells suit anything in frequent use, such as pedals and instruments, and reduce waste over time. For smoke alarms, many people fit a fresh alkaline cell once a year and keep a spare in the drawer.

Frequently Asked Questions

Is a PP3 the same as a 9V battery?
Yes. PP3 is the common name for the standard rectangular 9V battery with two snap terminals on top. The codes 6LR61 and 6F22 refer to the same size.

Which battery does a smoke alarm use?
Many smoke and carbon monoxide alarms use a 9V PP3 battery. Sealed ten-year alarms differ, but for replaceable-battery models the 9V is standard. Check the alarm for the type it needs.

Can I use a rechargeable 9V in a smoke alarm?
For life-safety devices a fresh alkaline or long-life lithium cell is generally recommended, so the alarm is not affected by the gradual self-discharge of a rechargeable. Always follow the alarm manufacturer's guidance.

How often should I change a 9V smoke alarm battery?
A common habit is once a year, and immediately if the alarm chirps to signal a low battery. Testing the alarm monthly is good practice.

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