Casio · Watches
Casio A100WE-1A battery
1 × 3V lithium coin cell
- Based on
- Casio documentation
- Last checked
- 7 October 2026
- Size
- 16 × 1.6 mm
- Voltage
- 3 V
- Rechargeable
- Not supported
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How to replace it
| Notes | Case-back service typically required; water resistance should be retested after opening. |
|---|
Sources
Last checked 7 October 2026
Need a CR1616?
Casio A100WE-1A uses 1 × CR1616.
Buy links go to Amazon (Associates where tagged) or other affiliate programmes when available. They never change the battery answer.
Helpful for this device
Optional tools for opening, testing or charging — separate from the battery answer.
Amazon links may earn us a commission. They do not change the battery answer.
Fluke 101 Digital MultimeterAccurate open-circuit voltage and basic electrical checks
Klein Tools MM400 MultimeterGeneral DC voltage checks including battery terminals
Digital multimeterMeasure open-circuit voltage and general electronics checks
Voltage alone does not establish usable capacity, especially for rechargeables.
Buy links are optional and separate from the battery answer.
Need to replace the device?
Casio A100WE-1A is still sold new. Only buy another if a fresh battery and the checks above did not help.
Buy links go to Amazon (Associates where tagged) or other affiliate programmes when available. They never change the battery answer.