380 / SR936W battery equivalent

Also sold as SR936W. 1.55 V with a flat discharge curve — the usual choice for quartz watches.

Chemistry

Silver oxide

Voltage

1.55 V

Size

9.5 × 3.6 mm

Inches

0.374 × 0.142 in

Drain

High drain (W)

Typical capacity

~70 mAh

Shop 380 on Amazon See in full chart

Equivalents by brand

Brand	Number
Renata	380
Energizer / Eveready	380
Maxell / Panasonic / Sony	SR936W
IEC size	SR936

Also known as

SR936WSR936

What it fits

High-drain watches that fit a 394-size cell. 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 SR936W is about 9.5 mm across and 3.6 mm thick.

Same size, different drain

These cells share the 9.5 × 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.

FAQ

What battery replaces a 380?

Any of these are common equivalents: 380, SR936W, SR936. They are 1.55 V silver oxide cells, 9.5 × 3.6 mm.

Is 380 the same as SR936W?

Yes — SR936W is the IEC / Japanese-brand name for the same 380 cell.

What devices use a 380?

High-drain watches that fit a 394-size cell