303 / SR44SW battery equivalent

Also sold as SR44SW. 1.55 V with a flat discharge curve — the usual choice for quartz watches.

Chemistry

Silver oxide

Voltage

1.55 V

Size

11.6 × 5.4 mm

Inches

0.457 × 0.213 in

Drain

Low drain (SW)

Typical capacity

~165 mAh

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Equivalents by brand

Brand	Number
Renata	303
Energizer / Eveready	303
Maxell / Panasonic / Sony	SR44SW
Varta	V303
Rayovac	303
Duracell	D303
Timex	A
Citizen	280-08
Seiko	SB-A9
IEC	SR44
IEC size	SR1154

Also known as

SR44SWV303D303A280-08SB-A9SR44SR1154SR1154SWSG13

What it fits

Larger analog watches, cameras, calculators. 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 SR44SW is about 11.6 mm across and 5.4 mm thick.

Same size, different drain

These cells share the 11.6 × 5.4 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 303?

Any of these are common equivalents: 303, SR44SW, V303, D303, A, 280-08, SB-A9, SR44. They are 1.55 V silver oxide cells, 11.6 × 5.4 mm.

Is 303 the same as SR44SW?

Yes — SR44SW is the IEC / Japanese-brand name for the same 303 cell.

What devices use a 303?

Larger analog watches, cameras, calculators