Battery Cross ReferenceButton cell equivalents

329 / SR731SW battery equivalent

Also sold as SR731SW. 1.55 V with a flat discharge curve — the usual choice for quartz watches.

Chemistry
Silver oxide
Voltage
1.55 V
Size
7.9 × 3.1 mm
Inches
0.311 × 0.122 in
Drain
Low drain (SW)
Typical capacity
~37 mAh
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Equivalents by brand

BrandNumber
Renata329
Energizer / Eveready329
Maxell / Panasonic / SonySR731SW
VartaV329
Rayovac329
DuracellD329
Philips329
IEC sizeSR731

Also known as

SR731SWV329D329SR731

What it fits

Analog watches and compact instruments. 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 SR731SW is about 7.9 mm across and 3.1 mm thick.

FAQ

What battery replaces a 329?

Any of these are common equivalents: 329, SR731SW, V329, D329, SR731. They are 1.55 V silver oxide cells, 7.9 × 3.1 mm.

Is 329 the same as SR731SW?

Yes — SR731SW is the IEC / Japanese-brand name for the same 329 cell.

What devices use a 329?

Analog watches and compact instruments