Watch battery · silver oxide
SR726SW (397) battery
SR726SW = 397 = SB-AL. 7.91 × 2.6 mm1 silver oxide, 1.55 V1. Equivalents: V397, B-SR59L, 607, 280-28, D397, 9931 and 5 more (14 codes in 12 code systems, full table); 93 calibres, modules and models in our base take it.
Cell types in this size
SR726SW
Low drain (SW): for plain analog watches · Silver Oxide2
13 codes in our sources name this cell type.
LR726
Alkaline cell of the same size: the IEC digits are the size, the L is the chemistry. LR726 lands on this page by that rule; our sources hold no alkaline datasheet for it, so no figures are shown.
Capacity by manufacturer
Energizer 397SR726SW
32 mAh2cutoff 1.3 V as printedDatasheet ↗
Can I use another cell instead of 397?
Verdicts follow our swap rules from the datasheet size, voltage and cell type.
Use instead of SR726SW
LR726
Fits, with a catchFits, but LR726 is alkaline and runs shorter.
Same 7.9 mm × 2.6 mm size. LR726 is an alkaline (L) cell; the watch is made for silver oxide (S). Use it to get the watch going, then fit SR726SW.
Draw both cells in the swap checkerNo: SR721SW is 0.5 mm thinner than SR726SW.
Same 7.9 mm diameter, but SR721SW is 2.1 mm against 2.6 mm: the contact spring may not reach it.
SR721SW: 7.9 mm1 × 2.1 mm1, 1.55 V1
Draw both cells in the swap checkerNo: SR731SW is 0.5 mm taller than SR726SW.
Same 7.9 mm diameter, but SR731SW stands 3.1 mm against 2.6 mm: the case back presses on it or does not close.
SR731SW: 7.9 mm1 × 3.1 mm1, 1.55 V1
Draw both cells in the swap checker
What uses 397
93 calibres, modules and models in our base name this size.
Seiko calibres42[3]
Seiko's battery chart gives 2–3 years of battery life for these calibres. Seiko, Pulsar, Lorus and Alba calibres share the chart.
- 2620
- 2621
- 2625
- 2626
- 2661
- 2625
- 2628
- 3421
All 42 calibres
- 3422
- 3423
- 8C22
- 8C23
- 8522
- 8523
- V421
- V422
- Y130
- Y131
- Y136
- Y468
- Y469
- Y541
- Y642
- Y643
- A547
- B200
- L221
- L223
- W200
- W201
- W207
- Y800
- Y490
- Y491
- Y499
- Y670
- E029
- V001
- V041
- V061
- V062
- F623
Casio modules3[4]
102 Casio models in Casio's manual index sit on these modules.
Watches with a page2
Questions
What is the 397 battery equivalent?
SR726SW, V397, B-SR59L, 607, 280-28, D397, 9931, 080-D20, SB-AL, SR726 and 1 more codes name the same 7.9 × 2.6 mm silver oxide cell as 397. Any maker's cell under one of these codes fits.
Is 362 the same as 397?
No. SR721SW is 0.5 mm thinner than SR726SW. Same 7.9 mm diameter, but SR721SW is 2.1 mm against 2.6 mm: the contact spring may not reach it.
Is LR726 the same as SR726SW?
No: LR726 is an alkaline cell of the same size, SR726SW is silver oxide. Fits, but LR726 is alkaline and runs shorter. Same 7.9 mm × 2.6 mm size. LR726 is an alkaline (L) cell; the watch is made for silver oxide (S). Use it to get the watch going, then fit SR726SW.
What watches use the 397 battery?
In our base: 42 Seiko calibres (2620, 2621, 2625, 2626…); 102 Casio models. The full lists are on this page, with the brand tables they come from.
How long does a 397 battery last in a watch?
Seiko's battery chart gives 2 to 3 years for its 40 calibres on this cell, 2 years most often. Life depends on the calibre's current draw, not on the cell alone.
Seiko battery chart[3]
Sources
Documents checked · Report a wrong number
- 1Murata — Watch Battery Selection Guide / Cross Reference · pdf · read
- 2Energizer Holdings, Inc. — Product datasheet ENERGIZER 397 · pdf · read
- 3Seiko Watch Corporation (service information) — Value Checking List / Battery No. Cross-reference Chart · pdf · read