SR621SW Battery Equivalent
SR621SW is the same cell as SG1, 364 and SR60, so any of those codes will fit; LR621 is the same size in alkaline and will work, though it runs out sooner.
- Chemistry
- silver oxide
- Voltage
- 1.55 V
- Size (Ø × H)
- 6.8 × 2.1 mm
- Typical capacity
- 19 mAh
IEC designation SR621. Sold as 364 ( low drain, SW) .
SR621SW equivalents
Direct replacements
The same cell under another code. Any of these fits, whatever the brand.
- SG1
- 364 · Low drain (SW)
- SR60
- SR621
Upgrade or downgrade
Same size, different chemistry. Read the verdict before you buy.
| Cell | Chemistry | Voltage | Verdict |
|---|---|---|---|
| LR621 | 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.
Low drain or high drain
SR621SW 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): 364
- A steady trickle of current: a quartz watch with hands, a thermometer, a key fob.
Both are 1.55 V and both fit the same holder, so either will run the device. The matched one lasts longer.
About the SR621SW cell
On the shelf it is sold with a SR621 on the pack .
SR621SW questions
- Is SG1 the same as SR621SW?
- Yes. SG1 is another code for the same cell: silver oxide, 1.55 V, 6.8 × 2.1 mm.
- Is 364 the same as SR621SW?
- Yes. 364 is another code for the same cell: silver oxide, 1.55 V, 6.8 × 2.1 mm.
- Can I use LR621 instead of SR621SW?
- Works, but runs out sooner. Avoid in watches and medical devices.
- Will SR616SW work in place of SR621SW?
- Same 6.8 mm diameter, but 1.65 mm tall instead of 2.1 mm. Only if the holder fits; thinner cells can lose contact.
- Will SR626SW work in place of SR621SW?
- Same 6.8 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 SR621SW?
- SR621SW is a 1.55 V silver oxide cell with a typical capacity of 19 mAh.
- What size is SR621SW?
- 6.8 mm across and 2.1 mm thick.