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Watch battery · silver oxide

SR621SW (364) battery

SR621SW = 364 = SB-AG. 6.81 × 2.15 mm1 Sources disagree: manufacturer 2.15 mm / secondary source 2.1 mm2 silver oxide, 1.55 V1. Equivalents: V364, B-SR60L, 602, 280-34, D364, 9911 and 6 more (15 codes in 14 code systems, full table); 194 calibres, modules and models in our base take it.

Sources checked · How we source numbers
SR621SW · 364: drawing to scaleSR621SW · 364: diameter 6.8 mm, height 2.15 mm.Ø 6.8−+2.15SR621SW · 364
SR621SW: face and edge view to scale, from the datasheet sizesDrawing from data, not a photo · mm
Diameter
6.8 mm1
Height
2.15 mm1
2 sources disagree; show every value
  • manufacturer 2.15 mm1
  • secondary source 2.1 mm2
Nominal voltage
1.55 V1
IEC designation
SR6211 · SR603

SR621SW equivalents

The same cell under 15 names. Any of them fits where 364 does.

Code systemSR621SWlow drain
IECSR6211SR601
Energizer3641
RayovacRW3202secondary source
DuracellD3642secondary source
VartaV3641
SeikoSB-AG1
Citizen280-341
Orient080-D291
TimexT1
Bulova6021
Omega99111
BerecB-SR60L1
MalloryD3641
WalthamF1

Size and chemistry

Diameter
6.8 mm1
Height
2.15 mm1
2 sources disagree; show every value
  • manufacturer 2.15 mm1
  • secondary source 2.1 mm2
Nominal voltage
1.55 V1
Chemistry
Silver Oxide3
IEC designation
SR6211 · SR603
1.653212.153642.6377
Every 6.8 mm silver oxide size with a page, edge view to scale. Only the height tells them apart.
Show SR621SW at true size (1:1)
1:1 · not calibrated: sizes are approximate
SR621SW: drawing to scaleSR621SW: diameter 6.8 mm, height 2.15 mm.Ø 6.8−+2.15SR621SW
01020304050

What uses 364

194 calibres, modules and models in our base name this size.

Seiko calibres131[4]

Seiko's battery chart gives 1.5–4 years of battery life for these calibres. Seiko, Pulsar, Lorus and Alba calibres share the chart.

  • 1320
  • 1400A
  • 1400C
  • 1421
  • 1428
  • 2A27
  • 2A22
  • 2A23
All 131 calibres
  • 2A24
  • 2A29
  • 2A32
  • 2A52
  • 2A54
  • 2A59
  • 2D22
  • 2K02
  • 2K03
  • 2K22
  • 2K23
  • 2320
  • 2340
  • 3E22
  • 3E23
  • 3E29
  • 3E32
  • 3E39
  • 3E25
  • 3L12
  • 3L14
  • 3L19
  • 3Y02
  • 3Y03
  • 3Y09
  • 4J52A
  • 4J52B
  • 4K22
  • 4K24
  • 4K25
  • 4K26
  • 4K34
  • 5Y95
  • 6N76
  • 7N01A
  • 7N07A
  • 7N08A
  • 7N82A
  • 7N83A
  • 7N85A
  • 7N89A
  • 7N01C
  • 7N07C
  • 7N08C
  • 7N82C
  • 7N83C
  • 7N85C
  • 7N89C
  • 7N01D
  • 7N07D
  • 7N08D
  • 7N82D
  • 7N83D
  • 7N89D
  • 8E38
  • 8Y21
  • 8620
  • 8621
  • V242
  • V243
  • V247
  • V248
  • V249
  • V250
  • V251
  • V252
  • V253
  • V256
  • V257
  • V258
  • V254
  • V267
  • V301
  • V610
  • V612
  • V701A
  • V707A
  • V782A
  • V783A
  • V785A
  • V789A
  • V701C
  • V707C
  • V708C
  • V782C
  • V783C
  • V785C
  • V789C
  • V701D
  • V707D
  • V708D
  • V782D
  • V783D
  • V789D
  • V708A
  • V802
  • V803
  • V806
  • V891
  • V892
  • V893
  • V894
  • V896
  • V899
  • VJ21
  • VJ22
  • VJ32
  • VJ33
  • VX51E
  • VX82
  • VX89
  • V892
  • V803
  • Y432
  • Y434
  • Y480
  • Y481
  • Y482
  • Y483
  • Y590
  • L122
  • W204
  • W210

Citizen models54[5]

On 10 calibres, from Citizen's battery table.

  • G11210 models
  • 15027 models
  • 11126 models
  • G0026 models
  • 10026 models
  • 63295 models
  • 10125 models
  • 11024 models
All 10 calibres
  • G0123 models
  • G1022 models
The 54 model numbers

AG8300-52L · AG8340-58E · AG8342-52L · AG8346-51A · AG8348-56L · BF0580-06E · BF0580-57L · BF0582-51F · BF0584-56E · BF2003-25A · BF2005-54A · BF2005-54L · BF2013-56E · BF2013-56P · BF2018-52A · BF2018-52E · BF5002-99P · BF5004-93A · BH1673-50E · BH1678-56E · BI1030-53A · BI1031-51X · BI1032-58L · BI1033-04E · BI1034-52E · BI1036-57L · BI5000-01A · BI5002-06E · BI5010-59E · BI5012-53E · BI5017-50E · BI5050-54E · BI5051-51A · BI5052-59E · BI5054-53L · BI5055-51E · EQ0530-51N · EQ0532-55E · EQ0534-50D · EQ0539-56Y · EQ0540-57A · EQ0593-26A · EQ0595-55L · EQ0603-59F · EQ0603-59P · EQ0605-53A · EQ2002-91P · EQ2004-95A · EU1974-57A · EU2252-56P · EU2254-51A · EU6010-53E · EU6080-58D · EU6084-57A

Watches with a page1

Cell types in this size

SR621SW

Low drain (SW): for plain analog watches · Silver Oxide3

15 codes in our sources name this cell type.

LR621

Alkaline cell of the same size: the IEC digits are the size, the L is the chemistry. LR621 lands on this page by that rule; our sources hold no alkaline datasheet for it, so no figures are shown.

Capacity by manufacturer

Energizer 364SR621SW

20 mAh3cutoff 1.3 V as printedDatasheet ↗

Can I use another cell instead of 364?

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

Check any other pair

  • Use instead of SR621SW

    LR621

    Fits, with a catch

    Fits, but LR621 is alkaline and runs shorter.

    Same 6.8 mm × 2.15 mm size. LR621 is an alkaline (L) cell; the watch is made for silver oxide (S). Use it to get the watch going, then fit SR621SW.

    Draw both cells in the swap checker

  • Use instead of SR621SW

    SR616SW

    No

    No: SR616SW is 0.5 mm thinner than SR621SW.

    Same 6.8 mm diameter, but SR616SW is 1.65 mm against 2.15 mm: the contact spring may not reach it.

    SR616SW: 6.8 mm1 × 1.65 mm1 Sources disagree: manufacturer 1.65 mm / secondary source 1.6 mm2, 1.55 V1

    Draw both cells in the swap checker

  • Use instead of SR621SW

    SR626SW

    No

    No: SR626SW is 0.45 mm taller than SR621SW.

    Same 6.8 mm diameter, but SR626SW stands 2.6 mm against 2.15 mm: the case back presses on it or does not close.

    SR626SW: 6.8 mm1 × 2.6 mm1, 1.55 V1

    Draw both cells in the swap checker

  • Use instead of SR621SW

    CTL621F

    No

    No: CTL621F is a rechargeable cell.

    SR621SW is a primary silver oxide battery, 1.55 V. CTL621F is cobalt-titanium rechargeable, 2.3 V; a battery-powered watch has no circuit to charge it.

    CTL621F: 6.8 mm6 × 2.1 mm6, 2.3 V6

    Draw both cells in the swap checker

  • Use instead of SR621SW

    MT621

    No

    No: MT621 is a rechargeable cell.

    SR621SW is a primary silver oxide battery, 1.55 V. MT621 is manganese-titanium rechargeable, 1.5 V; a battery-powered watch has no circuit to charge it.

    MT621: 6.8 mm7 × 2.1 mm7, 1.5 V7

    Draw both cells in the swap checker

Warnings from the makers

Not a stand-in for a 3 V lithium cell

“are 3 volts, not 1.5 volts and cannot be substituted for a 1.5 volt silver oxide watch battery”[2]secondary source

Questions

What is the 364 battery equivalent?

SR621SW, V364, B-SR60L, 602, 280-34, D364, 9911, 080-D29, SB-AG, SR621 and 2 more codes name the same 6.8 × 2.15 mm silver oxide cell as 364. Any maker's cell under one of these codes fits.

Is 321 the same as 364?

No. SR616SW is 0.5 mm thinner than SR621SW. Same 6.8 mm diameter, but SR616SW is 1.65 mm against 2.15 mm: the contact spring may not reach it.

Is LR621 the same as SR621SW?

No: LR621 is an alkaline cell of the same size, SR621SW is silver oxide. Fits, but LR621 is alkaline and runs shorter. Same 6.8 mm × 2.15 mm size. LR621 is an alkaline (L) cell; the watch is made for silver oxide (S). Use it to get the watch going, then fit SR621SW.

What watches use the 364 battery?

In our base: 131 Seiko calibres (1320, 1400A, 1400C, 1421…); 54 Citizen models. The full lists are on this page, with the brand tables they come from.

How long does a 364 battery last in a watch?

Seiko's battery chart gives 1.5 to 4 years for its 131 calibres on this cell, 2 years most often. Life depends on the calibre's current draw, not on the cell alone.

Seiko battery chart[4]

Sources

Documents checked · Report a wrong number

  1. 1Murata Manufacturing Co., Ltd. — Watch Battery Selection Guide / Cross Reference (1 page) · pdf · read
  2. 2WatchBattery (UK) Ltd — Watch Battery Cross Reference Table · html · read
  3. 3Energizer Holdings, Inc. — Product datasheet ENERGIZER 364 · pdf · read
  4. 4Seiko Watch Corporation (service information) — Value Checking List / Battery No. Cross-reference Chart · pdf · read