301 / SR43SW battery equivalent

Also sold as SR43SW. 1.55 V with a flat discharge curve — the usual choice for quartz watches.

Chemistry

Silver oxide

Voltage

1.55 V

Size

11.6 × 4.2 mm

Inches

0.457 × 0.165 in

Drain

Low drain (SW)

Typical capacity

~110 mAh

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Equivalents by brand

Brand	Number
Renata	301
Energizer / Eveready	301
Maxell / Panasonic / Sony	SR43SW
Varta	V301
Rayovac	301
Duracell	D301
Bulova	226
Timex	D
Citizen	280-01
Seiko	SB-A8
IEC	SR43
IEC size	SR1142

Also known as

SR43SWV301D301226D280-01SB-A8SR43SR1142SR1142SWSG12

What it fits

Analog watches, calculators, small medical devices. 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 SR43SW is about 11.6 mm across and 4.2 mm thick.

Same size, different drain

These cells share the 11.6 × 4.2 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 301?

Any of these are common equivalents: 301, SR43SW, V301, D301, 226, D, 280-01, SB-A8. They are 1.55 V silver oxide cells, 11.6 × 4.2 mm.

Is 301 the same as SR43SW?

Yes — SR43SW is the IEC / Japanese-brand name for the same 301 cell.

What devices use a 301?

Analog watches, calculators, small medical devices