384 / SR41SW battery equivalent

Also sold as SR41SW. 1.55 V with a flat discharge curve — the usual choice for quartz watches.

Chemistry

Silver oxide

Voltage

1.55 V

Size

7.9 × 3.6 mm

Inches

0.311 × 0.142 in

Drain

Low drain (SW)

Typical capacity

~45 mAh

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Equivalents by brand

Brand	Number
Renata	384
Energizer / Eveready	384
Maxell / Panasonic / Sony	SR41SW
Varta	V384
Rayovac	384
Duracell	D384
Bulova	247
Citizen	280-18
Seiko	SB-A1/D1
IEC	SR41
IEC size	SR736

Also known as

SR41SWV384D384247280-18SB-A1/D1SB-A1SB-D1SR41SR736SG3

What it fits

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 SR41SW is about 7.9 mm across and 3.6 mm thick.

Same size, different drain

These cells share the 7.9 × 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.

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 384?

Any of these are common equivalents: 384, SR41SW, V384, D384, 247, 280-18, SB-A1/D1, SB-A1. They are 1.55 V silver oxide cells, 7.9 × 3.6 mm.

Is 384 the same as SR41SW?

Yes — SR41SW is the IEC / Japanese-brand name for the same 384 cell.

What devices use a 384?

Analog watches