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Watch battery · silver oxide

SR731SW (329) battery

SR731SW = 329. 7.91 × 3.1 mm1 silver oxide, 1.55 V1. Equivalents: V329, SR731 (4 codes in 3 code systems, full table).

Sources checked · How we source numbers
SR731SW · 329: drawing to scaleSR731SW · 329: diameter 7.9 mm, height 3.1 mm.Ø 7.9−+3.1SR731SW · 329
SR731SW: face and edge view to scale, from the datasheet sizesDrawing from data, not a photo · mm
Diameter
7.9 mm1
Height
3.1 mm1
Nominal voltage
1.55 V1
IEC designation
SR7311

SR731SW equivalents

The same cell under 4 names. Any of them fits where 329 does.

Code systemSR731SWlow drain
IECSR7311
Energizer · Rayovac · Renata3291
VartaV3291

Size and chemistry

Diameter
7.9 mm1
Height
3.1 mm1
Nominal voltage
1.55 V1
Chemistry
Silver Oxide2
IEC designation
SR7311
1.253461.453411.653152.13622.63973.13293.63845.4393
Every 7.9 mm silver oxide size with a page, edge view to scale. Only the height tells them apart.
Show SR731SW at true size (1:1)
1:1 · not calibrated: sizes are approximate
SR731SW: drawing to scaleSR731SW: diameter 7.9 mm, height 3.1 mm.Ø 7.9−+3.1SR731SW
01020304050

Cell types in this size

SR731SW

Low drain (SW): for plain analog watches · Silver Oxide2

3 codes in our sources name this cell type.

LR731

Alkaline cell of the same size: the IEC digits are the size, the L is the chemistry. LR731 lands on this page by that rule; our sources hold no alkaline datasheet for it, so no figures are shown.

Capacity by manufacturer

Energizer 329SR731SW

39 mAh2cutoff 1.2 V as printedDatasheet ↗

Can I use another cell instead of 329?

Verdicts follow our swap rules from the datasheet size, voltage and cell type.

Check any other pair

  • Use instead of SR731SW

    LR731

    Fits, with a catch

    Fits, but LR731 is alkaline and runs shorter.

    Same 7.9 mm × 3.1 mm size. LR731 is an alkaline (L) cell; the watch is made for silver oxide (S). Use it to get the watch going, then fit SR731SW.

    Draw both cells in the swap checker

  • Use instead of SR731SW

    SR726SW

    No

    No: SR726SW is 0.5 mm thinner than SR731SW.

    Same 7.9 mm diameter, but SR726SW is 2.6 mm against 3.1 mm: the contact spring may not reach it.

    SR726SW: 7.9 mm1 × 2.6 mm1, 1.55 V1

    Draw both cells in the swap checker

  • Use instead of SR731SW

    SR41SW

    No

    No: SR41SW is 0.5 mm taller than SR731SW.

    Same 7.9 mm diameter, but SR41SW stands 3.6 mm against 3.1 mm: the case back presses on it or does not close.

    SR41SW: 7.9 mm1 × 3.6 mm1, 1.55 V1

    Draw both cells in the swap checker

What uses 329

No calibre, module or model in our base names SR731SW yet.

Questions

What is the 329 battery equivalent?

SR731SW, V329, SR731 name the same 7.9 × 3.1 mm silver oxide cell as 329. Any maker's cell under one of these codes fits.

Is 397 the same as 329?

No. SR726SW is 0.5 mm thinner than SR731SW. Same 7.9 mm diameter, but SR726SW is 2.6 mm against 3.1 mm: the contact spring may not reach it.

Is LR731 the same as SR731SW?

No: LR731 is an alkaline cell of the same size, SR731SW is silver oxide. Fits, but LR731 is alkaline and runs shorter. Same 7.9 mm × 3.1 mm size. LR731 is an alkaline (L) cell; the watch is made for silver oxide (S). Use it to get the watch going, then fit SR731SW.

Sources

Documents checked · Report a wrong number

  1. 1Murata — Watch Battery Selection Guide / Cross Reference · pdf · read
  2. 2Energizer Holdings, Inc. — Product datasheet ENERGIZER 329 · pdf · read