Watch battery · silver oxide
SR616SW (321) battery
SR616SW = 321 = SB-AF. 6.81 × 1.65 mm1 Sources disagree: manufacturer 1.65 mm / secondary source 1.6 mm2 silver oxide, 1.55 V1. Equivalents: V321, B-321L, 611, 280-73, 9934, SR616 and 5 more (14 codes in 12 code systems, full table); 40 calibres, modules and models in our base take it.
Size and chemistry
Show SR616SW at true size (1:1)
What uses 321
40 calibres, modules and models in our base name this size.
Seiko calibres33[4]
Seiko's battery chart gives 2–5 years of battery life for these calibres. Seiko, Pulsar, Lorus and Alba calibres share the chart.
- 1220
- 1230
- 1270
- 1221
- 1231
- 1271
- 2K00
- 2K01
All 33 calibres
- 3F30
- 3F31
- 3F81
- 4J42
- 4J45B
- 4J85A
- 5Y94
- 7N00A
- 7N00C
- 7N00D
- 7320
- 7370
- 7321
- 7371
- 8420
- V300
- V320
- V700A
- V700C
- V800
- V801
- V805
- VX50E
- Y580
- Y588
Citizen models6[5]
On 1 calibre, from Citizen's battery table.
- 96276 models
The 6 model numbers
EZ7002-54E · EZ7003-51X · EZ7010-56D · EZ7011-88A · EZ7012-85E · EZ7016-50D
Cell types in this size
SR616SW
Low drain (SW): for plain analog watches · Silver Oxide3
13 codes in our sources name this cell type.
LR616
Alkaline cell of the same size: the IEC digits are the size, the L is the chemistry. LR616 lands on this page by that rule; our sources hold no alkaline datasheet for it, so no figures are shown.
Capacity by manufacturer
Energizer 321SR616SW
15 mAh3cutoff 1.2 V as printedDatasheet ↗
Can I use another cell instead of 321?
Verdicts follow our swap rules from the datasheet size, voltage and cell type.
Use instead of SR616SW
LR616
Fits, with a catchFits, but LR616 is alkaline and runs shorter.
Same 6.8 mm × 1.65 mm size. LR616 is an alkaline (L) cell; the watch is made for silver oxide (S). Use it to get the watch going, then fit SR616SW.
Draw both cells in the swap checkerNo: SR621SW is 0.5 mm taller than SR616SW.
Same 6.8 mm diameter, but SR621SW stands 2.15 mm against 1.65 mm: the case back presses on it or does not close.
SR621SW: 6.8 mm1 × 2.15 mm1 Sources disagree: manufacturer 2.15 mm / secondary source 2.1 mm2, 1.55 V1
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 321 battery equivalent?
SR616SW, V321, B-321L, 611, 280-73, 9934, SB-AF, SR616, SR65, RW321 and 1 more codes name the same 6.8 × 1.65 mm silver oxide cell as 321. Any maker's cell under one of these codes fits.
Is 364 the same as 321?
No. SR621SW is 0.5 mm taller than SR616SW. Same 6.8 mm diameter, but SR621SW stands 2.15 mm against 1.65 mm: the case back presses on it or does not close.
Is LR616 the same as SR616SW?
No: LR616 is an alkaline cell of the same size, SR616SW is silver oxide. Fits, but LR616 is alkaline and runs shorter. Same 6.8 mm × 1.65 mm size. LR616 is an alkaline (L) cell; the watch is made for silver oxide (S). Use it to get the watch going, then fit SR616SW.
What watches use the 321 battery?
In our base: 33 Seiko calibres (1220, 1230, 1270, 1221…); 6 Citizen models. The full lists are on this page, with the brand tables they come from.
How long does a 321 battery last in a watch?
Seiko's battery chart gives 2 to 5 years for its 33 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
- 1Murata Manufacturing Co., Ltd. — Watch Battery Selection Guide / Cross Reference (1 page) · pdf · read
- 2WatchBattery (UK) Ltd — Watch Battery Cross Reference Table · html · read
- 3Energizer Holdings, Inc. — Product datasheet ENERGIZER 321 · pdf · read
- 4Seiko Watch Corporation (service information) — Value Checking List / Battery No. Cross-reference Chart · pdf · read
- 5Citizen Watch US — Battery Information (model / caliber / battery table) · html · read