Casio · Watches

Casio W-87H battery

1 × 3V lithium coin cell

Printed IDs: 1536 (Module)

How to replace it

Notes	Case-back service typically required; water resistance should be retested after opening.

Last checked 7 October 2026

Casio W-87H uses 1 × CR2016.

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Optional tools for opening, testing or charging — separate from the battery answer.

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Measure open-circuit voltage and general electronics checks
Voltage alone does not establish usable capacity, especially for rechargeables.
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A fresh 1 × CR2016 should restore Casio W-87H if the battery was the problem. Work through the checks below before replacing the device.

Check the battery type
This device needs 1 × CR2016 (lithium). Same size does not always mean the same battery.
Check known model-specific issues
Casio W-87H → module 1536 CR2016.
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.

These checks follow this device’s orientation, battery type, and important notes from the maker.