Casio · Watches
Casio BGA-110 battery
1 × 1.55V silver oxide button cell
Casio’s US manual index maps BGA-110 → module 5001; the Casio module battery list names SR726W (SR726SW / 397 trade size). Case-back service typically required.
How to replace it
| Notes | Case-back service typically required; water resistance should be retested after opening. |
|---|---|
| Access | Professional recommended |
Important
- Operation guide for module 5001 does not reprint the cell code — battery identity is from Casio model→module index plus the Casio module battery service list (SR726W / SR726SW).
- Retail packs often say 397.
Sources
Helpful for this device
Optional tools for opening, testing or charging — separate from the battery answer.
- Fluke 101 Digital Multimeter
Accurate open-circuit voltage and basic electrical checks
- Klein Tools MM400 Multimeter
General DC voltage checks including battery terminals
- Digital multimeter
Measure open-circuit voltage and general electronics checks
New battery but still not working?
A fresh 1 × SR726SW should restore Casio BGA-110 if the battery was the problem. Work through the checks below before replacing the device.
- Check the battery type
This device needs 1 × SR726SW (silver_oxide). Rechargeable cells are not supported for this device. Same size does not always mean the same battery.
- Check known model-specific issues
Operation guide for module 5001 does not reprint the cell code — battery identity is from Casio model→module index plus the Casio module battery service list (SR726W / SR726SW). Retail packs often say 397.
- Confirm the battery itself
For most coin cells, fitting a known-good fresh cell of the correct code is simpler than capacity testing.
- Still not responding?
If a correct, fresh battery installed properly does not restore the device, the fault may be elsewhere — the device may need service or replacement.