Watch battery · silver oxide
SR1120SW (381) battery
SR1120SW = 381 = SB-AS. 11.61 × 2.05 mm1 silver oxide, 1.55 V1. Equivalents: V381, B-SR55L, 317, 280-27, D381, 9922 and 4 more (13 codes in 11 code systems, full table); 44 calibres, modules and models in our base take it.
Cell types in this size
SR1120SW
Low drain (SW): for plain analog watches · Silver Oxide2
12 codes in our sources name this cell type.
LR1120
Alkaline cell of the same size: the IEC digits are the size, the L is the chemistry. LR1120 lands on this page by that rule; our sources hold no alkaline datasheet for it, so no figures are shown.
Capacity by manufacturer
Energizer 381SR1120SW
55 mAh2cutoff 1.2 V as printedDatasheet ↗
Can I use another cell instead of 381?
Verdicts follow our swap rules from the datasheet size, voltage and cell type.
Use instead of SR1120SW
LR1120
Fits, with a catchFits, but LR1120 is alkaline and runs shorter.
Same 11.6 mm × 2.05 mm size. LR1120 is an alkaline (L) cell; the watch is made for silver oxide (S). Use it to get the watch going, then fit SR1120SW.
Draw both cells in the swap checkerNo: SR1130SW is 1 mm taller than SR1120SW.
Same 11.6 mm diameter, but SR1130SW stands 3.05 mm against 2.05 mm: the case back presses on it or does not close.
SR1130SW: 11.6 mm3 × 3.05 mm3 Sources disagree: manufacturer 3.05 mm / secondary source 3 mm4, 1.55 V3
Draw both cells in the swap checker
What uses 381
44 calibres, modules and models in our base name this size.
Seiko calibres41[5]
Seiko's battery chart gives 1–5 years of battery life for these calibres. Seiko, Pulsar, Lorus and Alba calibres share the chart.
- 5Y13
- 5854
- 5855
- 5856
- 6423
- 6429
- 6430
- 6431
All 41 calibres
- 6432
- 6433
- 6439
- 8121
- 8122
- 8123
- 9223
- 9256
- 9441
- 9442
- 9443
- 9461
- 9481
- Y112
- Y113
- 9483
- A135
- A354
- A359
- A358
- D138
- F023
- F033
- G757
- W540
- W543
- Y816
- Y818
- Y819
- Y440
- Y450
- Y709
- V091
Citizen models2[6]
On 1 calibre, from Citizen's battery table.
- 89892 models
The 2 model numbers
JG2108-52W · JG2146-53H
Questions
What is the 381 battery equivalent?
SR1120SW, V381, B-SR55L, 317, 280-27, D381, 9922, 080-D14, SB-AS, SR1121 and 1 more codes name the same 11.6 × 2.05 mm silver oxide cell as 381. Any maker's cell under one of these codes fits.
Is 390 the same as 381?
No. SR1130SW is 1 mm taller than SR1120SW. Same 11.6 mm diameter, but SR1130SW stands 3.05 mm against 2.05 mm: the case back presses on it or does not close.
Is LR1120 the same as SR1120SW?
No: LR1120 is an alkaline cell of the same size, SR1120SW is silver oxide. Fits, but LR1120 is alkaline and runs shorter. Same 11.6 mm × 2.05 mm size. LR1120 is an alkaline (L) cell; the watch is made for silver oxide (S). Use it to get the watch going, then fit SR1120SW.
What watches use the 381 battery?
In our base: 41 Seiko calibres (5Y13, 5854, 5855, 5856…); 2 Citizen models. The full lists are on this page, with the brand tables they come from.
How long does a 381 battery last in a watch?
Seiko's battery chart gives 1 to 5 years for its 39 calibres on this cell, 2 years most often. Life depends on the calibre's current draw, not on the cell alone.
Seiko battery chart[5]
Sources
Documents checked · Report a wrong number
- 1Murata — Watch Battery Selection Guide / Cross Reference · pdf · read
- 2Energizer Holdings, Inc. — Product datasheet ENERGIZER 381 · pdf · read
- 3Murata Manufacturing Co., Ltd. — Watch Battery Selection Guide / Cross Reference (1 page) · pdf · read
- 4WatchBattery (UK) Ltd — Watch Battery Cross Reference Table · html · read
- 5Seiko Watch Corporation (service information) — Value Checking List / Battery No. Cross-reference Chart · pdf · read