It's definitely not something I would trust. Just watch yourself:

https://www.youtube.com/watch?v=V1MDGQzNMYI

It's a thin, twisty rubber gasket held in place by a flimsy plastic back.

And in my experience with anything involving thin rubber gaskets, they degrade and just flat-out break incredibly easily.

E.g. with wristwatches, it's common knowledge that as soon as you replace the battery in a water-resistant watch, you shouldn't consider it water-resistant anymore. You might get lucky once or twice in recreating the same seal it had at the factory, but you should probably assume you didn't.

That's how my Pebble watch died. It's a shame since it was a hackable device with good battery, but I misjudged resealing the device.

Huh, guess I am just that gullible to buy the marketing to the point where I now wonder: how the heck can you have a removable battery and also survive being held under water? (It has an IP67 rating.) I guess waterproof everything except the battery contacts and trust that the salinity is low enough that the 5V doesn't jump between the poles, plus it not being wet for long enough to start rusting (IP67 afaik doesn't require it to work a week later still)?

S5 checking in here - there's a rubber gasket all around the back cover.

Thanks! Seems so simple after all.

Older devices I used had gaskets around the battery contacts and a tight fastener. That seems to work well until the gasket eventually degrades over time.

As long as you don’t forget to close the flap.