The Huawei Watch 3 earns a 5 out of 10 on our repairability scale (10 is the easiest to repair):

Only press fit connectors are used with no overlapping cables.

Once the watch is open, the battery is easy to access and replace.

Opening the watch is doable, but not easy, due to the back cover's tight fit and use of adhesive instead of gaskets.

The only separately-accessible part on the back cover (the loudspeaker) requires some digging, and is glued into a tight recess.

A broken display requires replacing the main watch case which houses the screen.

The back cover and attached sensors requires a complete replacement if any of its components fails.