377 / SR626SW battery equivalent

Also sold as SR626SW. 1.55 V with a flat discharge curve — the usual choice for quartz watches.

Chemistry

Silver oxide

Voltage

1.55 V

Size

6.8 × 2.6 mm

Inches

0.268 × 0.102 in

Drain

Low drain (SW)

Typical capacity

~28 mAh

Shop 377 on Amazon See in full chart

Equivalents by brand

Brand	Number
Renata	377
Energizer / Eveready	377
Maxell / Panasonic / Sony	SR626SW
Varta	V377
Rayovac	377
Duracell	D377
Philips	377
Bulova	606
Timex	BA
Citizen	280-39
Seiko	SB-AW
IEC	SR66
IEC size	SR626

Also known as

SR626SWV377D377606BA280-39SB-AWSR66SR626SG4AG4

What it fits

The most common analog quartz watch battery. 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 SR626SW is about 6.8 mm across and 2.6 mm thick.

Same size, different drain

These cells share the 6.8 × 2.6 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 377?

Any of these are common equivalents: 377, SR626SW, V377, D377, 606, BA, 280-39, SB-AW. They are 1.55 V silver oxide cells, 6.8 × 2.6 mm.

Is 377 the same as SR626SW?

Yes — SR626SW is the IEC / Japanese-brand name for the same 377 cell.

What devices use a 377?

The most common analog quartz watch battery