Casio’s watch operation guides give the battery in their specifications. The guides for modules 3229 and 3298 carry the module number in their titles, such as Operation Guide 3298.
Casio module number
The battery it takes
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Who should change it
Casio’s guide for modules 3229, 3421 and 3489 says battery replacement requires special tools, and asks owners to always request it from the original retailer or an authorized CASIO service center.
A trained technician inspects the watch for proper water resistance when the battery is replaced, the same guide says. It also says to have the gaskets replaced about once every two or three years to keep the watch water resistant.
The backlight and battery life
Casio’s guides for modules 3229 and 3298 both say frequent use of the backlight shortens the battery life given in their specifications.
The battery a new watch comes with
The 3229 guide says the battery in a new watch is a test battery, used at the factory to check function and performance, and it may go dead sooner than the rated life.
Signs of a low battery
The same guide lists a large timekeeping error, dim display contents or a blank display as signs of low battery power, and says to replace the battery as soon as possible, because running on low power can cause malfunction.
Casio watches with a silver oxide cell
Casio’s guides for modules 5125 and 5067 give a silver oxide SR626SW instead of a lithium coin cell. See 377 battery equivalent for its size and other codes.
If a child swallows a button battery
The National Capital Poison Center says that if anyone swallows a battery, immediately call the 24-hour National Battery Ingestion Hotline at 1-800-498-8666 or your poison center at 1-800-222-1222. Don’t delay. Immediate treatment decreases severity.