Watch battery · silver oxide
SR626SW (377) battery
SR626SW = 377 = SB-AW. 6.81 × 2.6 mm1 silver oxide, 1.55 V1. Equivalents: SR626W, V377, B-377L, 606, 280-39, 9933 and 13 more (22 codes in 13 code systems, full table); 56 calibres, modules and models in our base take it.
SR626SW equivalents
The same cell under 22 names. Any of them fits where 377 does; the drain type is the column.
| Code system | SR626SWlow drain | SR626Whigh drain | LR626alkaline |
|---|---|---|---|
| IEC | SR6261SR661 | SR66W2secondary source | — |
| Energizer | 3771 | 3761 | — |
| Rayovac | RW3292secondary source | — | — |
| Duracell | D3772secondary source | — | — |
| Varta | V3771 | — | — |
| Seiko | SB-AW1 | SB-BW1 | — |
| Citizen | 280-391 | 280-721 | — |
| Timex | BA1 | MA1 | — |
| Bulova | 6061 | 6191 | — |
| Omega | 99331 | — | — |
| Berec | B-377L1 | — | — |
| Waltham | I1 | — | — |
| Common name | — | — | AG46seller listing Sources disagree: seller listing AG4 / seller listing AG4 is alkaline (LR626 chemistry)6 |
What uses 377
56 calibres, modules and models in our base name this size.
Movements2
Seiko calibres48[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.
- 5Y91
- 6G28
- 6G34
- PC21
- V306
- V500A
- V501A
- V506
All 48 calibres
- V511
- V515A
- V517
- V500G
- V501G
- V515F
- V515G
- V501C
- V52F
- V507A
- V507C
- V52G
- V516
- V610
- V612
- V821A
- V827
- V828
- V829
- V821C
- V824
- VD78
- Y121A
- Y121G
- Y136G
- Y974
- Y975
- Y977
- Y978
- W209
- Y792
- Y798
- Y799
- NX01
- NX03
- NX02
- NX04
- NX11
- NX14
- NX15A
Watches with a page3
Cell types in this size
2 cell types share the 6.8 × 2.6 mm size.
SR626SW
Low drain (SW): for plain analog watches · Silver Oxide3
13 codes in our sources name this cell type.
SR626W
High drain (W): for watches with lights, alarms or chronographs · Silver Oxide5
6 codes in our sources name this cell type.
LR626
Alkaline cell of the same size: the IEC digits are the size, the L is the chemistry. LR626 lands on this page by that rule; our sources hold no alkaline datasheet for it, so no figures are shown.
Can I use another cell instead of 377?
Verdicts follow our swap rules from the datasheet size, voltage and cell type.
Use instead of SR626SW
SR626W
Fits, with a catchFits: SR626W is the high-drain version of the same size.
SR626W and SR626SW are both 6.8 mm × 2.6 mm, 1.55 V silver oxide. SR626W is made for bursts of current (lights, alarms); in a plain watch it works but may not last as long as SR626SW.
Draw both cells in the swap checkerUse instead of SR626SW
LR626
Fits, with a catchFits, but LR626 is alkaline and runs shorter.
Same 6.8 mm × 2.6 mm size. LR626 is an alkaline (L) cell; the watch is made for silver oxide (S). Use it to get the watch going, then fit SR626SW.
Draw both cells in the swap checkerNo: SR621SW is 0.45 mm thinner than SR626SW.
Same 6.8 mm diameter, but SR621SW is 2.15 mm against 2.6 mm: the contact spring may not reach it.
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
Capacity by manufacturer
Energizer 377SR626SW
24 mAh3cutoff 1.2 V as printedDatasheet ↗
Energizer 376SR626W
26 mAh5cutoff 1.3 V as printedDatasheet ↗
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 377 battery equivalent?
SR626SW, SR626W, V377, B-377L, 606, 280-39, 9933, SB-AW, SR626, SR66 and 8 more codes name the same 6.8 × 2.6 mm silver oxide cell as 377. Any maker's cell under one of these codes fits; match the drain type (SW or W) when the watch maker names one.
Is 364 the same as 377?
No. SR621SW is 0.45 mm thinner than SR626SW. Same 6.8 mm diameter, but SR621SW is 2.15 mm against 2.6 mm: the contact spring may not reach it.
Can I use 376 instead of 377?
Yes, it fits: 376 is SR626W, the high-drain cell of the same size. SR626W and SR626SW are both 6.8 mm × 2.6 mm, 1.55 V silver oxide. SR626W is made for bursts of current (lights, alarms); in a plain watch it works but may not last as long as SR626SW.
Is LR626 the same as SR626SW?
No: LR626 is an alkaline cell of the same size, SR626SW is silver oxide. Fits, but LR626 is alkaline and runs shorter. Same 6.8 mm × 2.6 mm size. LR626 is an alkaline (L) cell; the watch is made for silver oxide (S). Use it to get the watch going, then fit SR626SW.
What watches use the 377 battery?
In our base: 48 Seiko calibres (5Y91, 6G28, 6G34, PC21…); 4 Casio models; movements such as Miyota 2035, Miyota 2315. The full lists are on this page, with the brand tables they come from.
How long does a 377 battery last in a watch?
Seiko's battery chart gives 1.5 to 4 years for its 47 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 377 · pdf · read
- 4Seiko Watch Corporation (service information) — Value Checking List / Battery No. Cross-reference Chart · pdf · read
- 5Energizer Holdings, Inc. — Product datasheet ENERGIZER 376 · pdf · read