Battery

9V

9V alkaline

9V is a rectangular multi-cell battery. Some remotes and life-safety alarms require a specific chemistry (for example lithium 9V) — check the device or alarm label, never guess from a neighbour’s unit. Many smoke alarms use AA or sealed packs instead — identify the model first.

Chemistry: alkaline
Voltage: 9 V
Width: 26.5 mm
Depth: 17.5 mm
Height: 48.5 mm
Used by: 11 devices

Common uses: Meters · Pedals

9V Diagram

Brand-neutral outline — confirm the tray in your device.

Other names

Genuine aliases and pack labels for this battery — not substitutes of a different chemistry.

6LR61 · PP3 · MN1604

Related codes

Same battery / other names

9VPP3

Also sold as

Brand or pack name for the same battery.

9V6LR61

Also sold as

Brand or pack name for the same battery.

9VMN1604

Also sold as

Brand or pack name for the same battery.

Size

26.5 × 17.5 × 48.5 mm

Rectangular envelope: width × depth × height.

Device-specific caveats

From manufacturer-backed notes on devices that use 9V — not generic advice.

Rechargeable 9V packs are not approved for this alarm family per First Alert support guidance.

Devices using 9V

All (11)Smoke & CO alarms (6)Garage remotes (3)Aviation headsets (1)Smart locks (1)Firex (3)Chamberlain (2)Kidde (2)

Used in

Smoke & CO alarms6 devices Garage remotes3 devices Aviation headsets1 device Smart locks1 device

Brands: Firex · Chamberlain · Kidde

Learn more

Testers & chargers

Optional tools that fit this cell type — only where the chemistry allows. Separate from the battery answer.

Amazon links may earn us a commission. They do not change the battery answer.

Ansmann Energy Check LCD
Quick household cell check (good / low / replace)
Docs Buy on Amazon More tools
Panasonic eneloop BQ-CC55 charger
Everyday NiMH AA/AAA charging (eneloop ecosystem)
Docs Buy on Amazon More tools
PowerEx MH-C9000 WizardOne Charger-Analyzer
Charge, discharge and measure capacity of NiMH AA/AAA
Docs Buy on Amazon More tools

Battery tester
Quick good / low / dead check for household cells
Crude check only — does not measure capacity under realistic load.
How to test a battery Buy on Amazon

Buy links are optional and separate from the battery answer.

Need one?

Need a 9V?

Search Amazon for packs of this battery code.

Buy on Amazon Amazon UK

Buy links go to Amazon (Associates where tagged) or other affiliate programmes when available. They never change the battery answer.