392 / SR41W battery equivalent

Also sold as SR41W. 1.55 V with a flat discharge curve — the usual choice for quartz watches.

Chemistry

Silver oxide

Voltage

1.55 V

Size

7.9 × 3.6 mm

Inches

0.311 × 0.142 in

Drain

High drain (W)

Typical capacity

~45 mAh

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Equivalents by brand

Brand	Number
Renata	392
Energizer / Eveready	392
Maxell / Panasonic / Sony	SR41W
Varta	V392
Rayovac	392
Duracell	D392
Bulova	247B
Timex	K
Citizen	280-13
Seiko	SB-B1
IEC	SR41
IEC size	SR736

Also known as

SR41WV392D392247BK280-13SB-B1SR41SR736AG3

What it fits

High-drain watches, thermometers, small electronics. 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 SR41W is about 7.9 mm across and 3.6 mm thick.

Same size, different drain

These cells share the 7.9 × 3.6 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.

Same size, different chemistry

These fit the same cavity but are not true equivalents. Voltage and discharge curve differ — do not use them as a silent swap in a quartz watch.

FAQ

What battery replaces a 392?

Any of these are common equivalents: 392, SR41W, V392, D392, 247B, K, 280-13, SB-B1. They are 1.55 V silver oxide cells, 7.9 × 3.6 mm.

Is 392 the same as SR41W?

Yes — SR41W is the IEC / Japanese-brand name for the same 392 cell.

What devices use a 392?

High-drain watches, thermometers, small electronics