366 / SR1116SW battery equivalent

Also sold as SR1116SW. 1.55 V with a flat discharge curve — the usual choice for quartz watches.

Chemistry

Silver oxide

Voltage

1.55 V

Size

11.6 × 1.65 mm

Inches

0.457 × 0.065 in

Drain

Low drain (SW)

Typical capacity

~32 mAh

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Equivalents by brand

Brand	Number
Renata	366
Energizer / Eveready	366
Maxell / Panasonic / Sony	SR1116SW
Varta	V366
Rayovac	366
Duracell	D366
Bulova	608
Citizen	280-46
IEC size	SR1116

Also known as

SR1116SWV366D366608280-46SR1116

What it fits

Thin analog watches. 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 SR1116SW is about 11.6 mm across and 1.65 mm thick.

Same size, different drain

These cells share the 11.6 × 1.65 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 366?

Any of these are common equivalents: 366, SR1116SW, V366, D366, 608, 280-46, SR1116. They are 1.55 V silver oxide cells, 11.6 × 1.65 mm.

Is 366 the same as SR1116SW?

Yes — SR1116SW is the IEC / Japanese-brand name for the same 366 cell.

What devices use a 366?

Thin analog watches