[names_are_hard]

You can buy a Casio watch for about 20 USD that claims to resist water to 100 meters. The battery replacement requires a small screwdriver, does that count as user-replaceable?

[crazygringo]

It's well known that Casio and similar watches will usually lose water resistance after the battery is changed.

The advertised water resistance is only for the original battery, case unopened.