Watch battery · silver oxide
SR936SW (394) battery
SR936SW = 394 = SB-A4. 9.51 × 3.6 mm1 silver oxide, 1.55 V1. Equivalents: SR936W, V394, B-SR45L, 625, 280-17, D394 and 6 more (15 codes in 12 code systems, full table); 35 calibres, modules and models in our base take it.
SR936SW equivalents
The same cell under 15 names. Any of them fits where 394 does; the drain type is the column.
What uses 394
35 calibres, modules and models in our base name this size.
Seiko calibres30[4]
Seiko's battery chart gives 2–5 years of battery life for these calibres. Seiko, Pulsar, Lorus and Alba calibres share the chart.
- 4822B
- 4823B
- 4883B
- 4840B
- 4842B
- 4843B
- 6T63
- 7A07
All 30 calibres
- 7A28
- 7A34
- 7A36
- 7A38
- 7A48
- 7A54
- 8221
- 8222
- 8223
- 8229
- 8241
- 8242
- 8243
- 8249
- VK67
- VK73
- Y561
- Y562
- Y563
- Y572
- Y573
- H127
Watches with a page3
Cell types in this size
2 cell types share the 9.5 × 3.6 mm size.
SR936SW
Low drain (SW): for plain analog watches · Silver Oxide3
13 codes in our sources name this cell type.
SR936W
High drain (W): for watches with lights, alarms or chronographs · Silver Oxide2secondary source
1 code in our sources names this cell type.
LR936
Alkaline cell of the same size: the IEC digits are the size, the L is the chemistry. LR936 lands on this page by that rule; our sources hold no alkaline datasheet for it, so no figures are shown.
Capacity by manufacturer
Energizer 394SR936SW
60 mAh3cutoff 1.3 V as printedDatasheet ↗
Can I use another cell instead of 394?
Verdicts follow our swap rules from the datasheet size, voltage and cell type.
Use instead of SR936SW
SR936W
Fits, with a catchFits: SR936W is the high-drain version of the same size.
SR936W and SR936SW are both 9.5 mm × 3.6 mm, 1.55 V silver oxide. SR936W is made for bursts of current (lights, alarms); in a plain watch it works but may not last as long as SR936SW.
Draw both cells in the swap checkerUse instead of SR936SW
LR936
Fits, with a catchFits, but LR936 is alkaline and runs shorter.
Same 9.5 mm × 3.6 mm size. LR936 is an alkaline (L) cell; the watch is made for silver oxide (S). Use it to get the watch going, then fit SR936SW.
Draw both cells in the swap checkerNo: SR927SW is 0.9 mm thinner than SR936SW.
Same 9.5 mm diameter, but SR927SW is 2.7 mm against 3.6 mm: the contact spring may not reach it.
SR927SW: 9.5 mm1 × 2.7 mm1, 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 394 battery equivalent?
SR936SW, SR936W, V394, B-SR45L, 625, 280-17, D394, 9919, SB-A4, SR936 and 3 more codes name the same 9.5 × 3.6 mm silver oxide cell as 394. Any maker's cell under one of these codes fits; match the drain type (SW or W) when the watch maker names one.
Is 395 the same as 394?
No. SR927SW is 0.9 mm thinner than SR936SW. Same 9.5 mm diameter, but SR927SW is 2.7 mm against 3.6 mm: the contact spring may not reach it.
Can I use 380 instead of 394?
Yes, it fits: 380 is SR936W, the high-drain cell of the same size. SR936W and SR936SW are both 9.5 mm × 3.6 mm, 1.55 V silver oxide. SR936W is made for bursts of current (lights, alarms); in a plain watch it works but may not last as long as SR936SW.
Is LR936 the same as SR936SW?
No: LR936 is an alkaline cell of the same size, SR936SW is silver oxide. Fits, but LR936 is alkaline and runs shorter. Same 9.5 mm × 3.6 mm size. LR936 is an alkaline (L) cell; the watch is made for silver oxide (S). Use it to get the watch going, then fit SR936SW.
What watches use the 394 battery?
In our base: 30 Seiko calibres (4822B, 4823B, 4883B, 4840B…); movements such as TMI VK63, TMI VK64. The full lists are on this page, with the brand tables they come from.
How long does a 394 battery last in a watch?
Seiko's battery chart gives 2 to 5 years for its 30 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 394 · pdf · read
- 4Seiko Watch Corporation (service information) — Value Checking List / Battery No. Cross-reference Chart · pdf · read