370 / SR920W battery equivalent

Also sold as SR920W. 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

High drain (W)

Typical capacity

~36 mAh

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Equivalents by brand

Brand	Number
Renata	370
Energizer / Eveready	370
Maxell / Panasonic / Sony	SR920W
Varta	V370
Rayovac	370
Duracell	D370
Bulova	620
Timex	Z
Citizen	280-51
Seiko	SB-BN
IEC	SR69
IEC size	SR921

Also known as

SR920WV370D370620Z280-51SB-BNSR69SR921SR920AG6SG6

What it fits

Watches with alarms, lights, or digital features. 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 SR920W 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 370?

Any of these are common equivalents: 370, SR920W, V370, D370, 620, Z, 280-51, SB-BN. They are 1.55 V silver oxide cells, 9.5 × 2.1 mm.

Is 370 the same as SR920W?

Yes — SR920W is the IEC / Japanese-brand name for the same 370 cell.

What devices use a 370?

Watches with alarms, lights, or digital features