SR1120SW Battery Equivalent
SR1120SW is the same cell as SG8, 381, 391, SR55 and SR1121, so any of those codes will fit; LR1120 is the same size in alkaline and will work, though it runs out sooner.
- Chemistry
- silver oxide
- Voltage
- 1.55 V
- Size (Ø × H)
- 11.6 × 2.1 mm
- Typical capacity
- 50 mAh
IEC designation SR1121. Sold as 381 ( low drain, SW) and 391 ( high drain, W) .
SR1120SW equivalents
Direct replacements
The same cell under another code. Any of these fits, whatever the brand.
- SG8
- 381 · Low drain (SW)
- 391 · High drain (W)
- SR55
- SR1120
Upgrade or downgrade
Same size, different chemistry. Read the verdict before you buy.
| Cell | Chemistry | Voltage | Verdict |
|---|---|---|---|
| LR1120 | alkaline | 1.5 V | Downgrade Works, but runs out sooner. Avoid in watches and medical devices. |
Similar size, check the fit
Same diameter, different thickness. These are not drop-in replacements.
| Cell | Size | Verdict |
|---|---|---|
| SR1116SW | 11.6 × 1.65 mm | Same 11.6 mm diameter, but 1.65 mm tall instead of 2.1 mm. Only if the holder fits; thinner cells can lose contact. |
| SR1126 | 11.6 × 2.6 mm | Same 11.6 mm diameter, but 2.6 mm tall instead of 2.1 mm. Only if the holder fits; thinner cells can lose contact. |
| SR1130SW | 11.6 × 3.1 mm | Same 11.6 mm diameter, but 3.1 mm tall instead of 2.1 mm. Only if the holder fits; thinner cells can lose contact. |
| SR42 | 11.6 × 3.6 mm | Same 11.6 mm diameter, but 3.6 mm tall instead of 2.1 mm. Only if the holder fits; thinner cells can lose contact. |
| SR43 | 11.6 × 4.2 mm | Same 11.6 mm diameter, but 4.2 mm tall instead of 2.1 mm. Only if the holder fits; thinner cells can lose contact. |
| SR44 | 11.6 × 5.4 mm | Same 11.6 mm diameter, but 5.4 mm tall instead of 2.1 mm. Only if the holder fits; thinner cells can lose contact. |
Low drain or high drain
SR1120SW is sold under two numbers for the same case size. Manufacturers mark low-drain cells SW and high-drain cells W, which records what the cell is built to deliver rather than how big it is.
- Low drain (SW): 381
- A steady trickle of current: a quartz watch with hands, a thermometer, a key fob.
- High drain (W): 391
- Short bursts of heavier current: a watch with a backlight, an alarm or a chronograph.
Both are 1.55 V and both fit the same holder, so either will run the device. The matched one lasts longer.
About the SR1120SW cell
On the shelf it is sold with a SR1120 on the pack .
SR1120SW questions
- Is SG8 the same as SR1120SW?
- Yes. SG8 is another code for the same cell: silver oxide, 1.55 V, 11.6 × 2.1 mm.
- Is 381 the same as SR1120SW?
- Yes. 381 is another code for the same cell: silver oxide, 1.55 V, 11.6 × 2.1 mm.
- Can I use LR1120 instead of SR1120SW?
- Works, but runs out sooner. Avoid in watches and medical devices.
- Will SR1116SW work in place of SR1120SW?
- Same 11.6 mm diameter, but 1.65 mm tall instead of 2.1 mm. Only if the holder fits; thinner cells can lose contact.
- Will SR1126 work in place of SR1120SW?
- Same 11.6 mm diameter, but 2.6 mm tall instead of 2.1 mm. Only if the holder fits; thinner cells can lose contact.
- What voltage is SR1120SW?
- SR1120SW is a 1.55 V silver oxide cell with a typical capacity of 50 mAh.
- What size is SR1120SW?
- 11.6 mm across and 2.1 mm thick.