SR521SW Battery Equivalent
SR521SW is the same cell as SG0, 379 and SR63, so any of those codes will fit; LR521 is the same size in alkaline and will work, though it runs out sooner.
- Chemistry
- silver oxide
- Voltage
- 1.55 V
- Size (Ø × H)
- 5.8 × 2.1 mm
- Typical capacity
- 16 mAh
IEC designation SR521.
SR521SW equivalents
Direct replacements
The same cell under another code. Any of these fits, whatever the brand.
- SG0
- 379
- SR63
- SR521
Upgrade or downgrade
Same size, different chemistry. Read the verdict before you buy.
| Cell | Chemistry | Voltage | Verdict |
|---|---|---|---|
| LR521 | 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 |
|---|---|---|
| SR512 | 5.8 × 1.2 mm | Same 5.8 mm diameter, but 1.2 mm tall instead of 2.1 mm. Only if the holder fits; thinner cells can lose contact. |
| SR516SW | 5.8 × 1.6 mm | Same 5.8 mm diameter, but 1.6 mm tall instead of 2.1 mm. Only if the holder fits; thinner cells can lose contact. |
| SR527SW | 5.8 × 2.7 mm | Same 5.8 mm diameter, but 2.7 mm tall instead of 2.1 mm. Only if the holder fits; thinner cells can lose contact. |
About the SR521SW cell
On the shelf it is sold with a SR521 on the pack .
SR521SW questions
- Is SG0 the same as SR521SW?
- Yes. SG0 is another code for the same cell: silver oxide, 1.55 V, 5.8 × 2.1 mm.
- Is 379 the same as SR521SW?
- Yes. 379 is another code for the same cell: silver oxide, 1.55 V, 5.8 × 2.1 mm.
- Can I use LR521 instead of SR521SW?
- Works, but runs out sooner. Avoid in watches and medical devices.
- Will SR512 work in place of SR521SW?
- Same 5.8 mm diameter, but 1.2 mm tall instead of 2.1 mm. Only if the holder fits; thinner cells can lose contact.
- Will SR516SW work in place of SR521SW?
- Same 5.8 mm diameter, but 1.6 mm tall instead of 2.1 mm. Only if the holder fits; thinner cells can lose contact.
- What voltage is SR521SW?
- SR521SW is a 1.55 V silver oxide cell with a typical capacity of 16 mAh.
- What size is SR521SW?
- 5.8 mm across and 2.1 mm thick.