371 / SR920SW battery equivalent

Also sold as SR920SW. 1.55 V with a flat discharge curve — the usual choice for quartz watches.

Chemistry

Silver oxide

Voltage

1.55 V

Size

9.5 × 2.1 mm

Inches

0.374 × 0.083 in

Drain

Low drain (SW)

Typical capacity

~38 mAh

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Equivalents by brand

Brand	Number
Renata	371
Energizer / Eveready	371
Maxell / Panasonic / Sony	SR920SW
Varta	V371
Rayovac	371
Duracell	D371
Bulova	605
Citizen	280-31
Seiko	SB-AN
IEC	SR69
IEC size	SR921

Also known as

SR920SWV371D371605280-31SB-ANSR69SR921SR920SG6

What it fits

Dress watches and standard analog quartz watches. Confirm the printed number or measure the old cell before you buy — a 0.5 mm height difference will not seat correctly.

IEC names encode chemistry and size. SR is silver oxide, LR is alkaline, and CR is 3 V lithium. The digits are diameter and height in tenths of a millimeter, so SR920SW is about 9.5 mm across and 2.1 mm thick.

Same size, different drain

These cells share the 9.5 × 2.1 mm can. Low-drain (SW) is for simple analog watches. High-drain (W) handles lights, alarms, and chronographs. A modern multi-drain cell can usually cover both.

FAQ

What battery replaces a 371?

Any of these are common equivalents: 371, SR920SW, V371, D371, 605, 280-31, SB-AN, SR69. They are 1.55 V silver oxide cells, 9.5 × 2.1 mm.

Is 371 the same as SR920SW?

Yes — SR920SW is the IEC / Japanese-brand name for the same 371 cell.

What devices use a 371?

Dress watches and standard analog quartz watches