Watch battery · silver oxide
SR44SW (303) battery
SR44SW = 303 = SB-A9. 11.61 × 5.4 mm1 silver oxide, 1.55 V1. Equivalents: V303, B-SR44L, 280-08, D303, SR1154, SR44 and 1 more (10 codes in 8 code systems, full table); 26 calibres, modules and models in our base take it.
What uses 303
26 calibres, modules and models in our base name this size.
Seiko calibres26[3]
Seiko's battery chart gives 1–5 years of battery life for these calibres. Seiko, Pulsar, Lorus and Alba calibres share the chart.
- 3800
- 3802
- 3803
- 3820
- 3819
- 3870
- 3823
- 3862
All 26 calibres
- 3863
- 3883
- 3922
- 3923
- 8A20
- 8A21
- 8A23
- 8A24
- 0614
- 8700
- S060
- S101
- S111
- S119
- S341
- W060
- W921
- W943
Cell types in this size
SR44SW
Low drain (SW): for plain analog watches · Silver Oxide2
9 codes in our sources name this cell type.
LR44
Alkaline cell of the same size: the IEC digits are the size, the L is the chemistry. LR44 lands on this page by that rule; our sources hold no alkaline datasheet for it, so no figures are shown.
Capacity by manufacturer
Energizer 303SR44SW
175 mAh2cutoff 1.3 V as printedDatasheet ↗
Can I use another cell instead of 303?
Verdicts follow our swap rules from the datasheet size, voltage and cell type.
Use instead of SR44SW
LR44
Fits, with a catchFits, but LR44 is alkaline and runs shorter.
Same 11.6 mm × 5.4 mm size. LR44 is an alkaline (L) cell; the watch is made for silver oxide (S). Use it to get the watch going, then fit SR44SW.
Draw both cells in the swap checkerNo: SR43SW is 1.2 mm thinner than SR44SW.
Same 11.6 mm diameter, but SR43SW is 4.2 mm against 5.4 mm: the contact spring may not reach it.
SR43SW: 11.6 mm1 × 4.2 mm1, 1.55 V1
Draw both cells in the swap checker
Questions
What is the 303 battery equivalent?
SR44SW, V303, B-SR44L, 280-08, D303, SB-A9, SR1154, SR44 name the same 11.6 × 5.4 mm silver oxide cell as 303. Any maker's cell under one of these codes fits.
Is 301 the same as 303?
No. SR43SW is 1.2 mm thinner than SR44SW. Same 11.6 mm diameter, but SR43SW is 4.2 mm against 5.4 mm: the contact spring may not reach it.
Is LR44 the same as SR44SW?
No: LR44 is an alkaline cell of the same size, SR44SW is silver oxide. Fits, but LR44 is alkaline and runs shorter. Same 11.6 mm × 5.4 mm size. LR44 is an alkaline (L) cell; the watch is made for silver oxide (S). Use it to get the watch going, then fit SR44SW.
What watches use the 303 battery?
In our base: 26 Seiko calibres (3800, 3802, 3803, 3820…). The full lists are on this page, with the brand tables they come from.
How long does a 303 battery last in a watch?
Seiko's battery chart gives 1 to 5 years for its 25 calibres on this cell, 1 year 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 303 · pdf · read
- 3Seiko Watch Corporation (service information) — Value Checking List / Battery No. Cross-reference Chart · pdf · read