Dead battery

Dead battery: what do I buy?

Use whatever you can tell about the cell, in any order. Skip what you cannot check. The answer updates as you go.

Shape

What does it look like?

Flat coinWide, thin, often starts with CR or BR Small buttonWatch or toy cell, under 12 mm Hearing-aid cellButton with a sticker tab or air holes Small cylinderA23, A27, N, CR123A Box or pack9 V, CR-P2, 2CR5 Not sureSearch everything

Size

Measure it

Calipers are best. A ruler gets the diameter close. Height is the thickness of a coin or the length of a cylinder.

Diameter, mm Height, mm Tolerance

No ruler? Lay the cell on the screen at true size.

Printed code

Read the code printed on it

Look at the flat face. Wipe it and tilt it under a light. The code is often tiny: CR2032, LR44, SR626SW, 377, 312.

Code on the cell

Your answer

Pick a shape, enter a size, or type the code.