The Samsung Galaxy Watch4 and the Galaxy Watch4 Classic earn a 7 out of 10 on our repairability scale (10 is the easiest to repair):

Opening is straightforward and requires some prying—but no heat.

The batteries are easily accessible and use only mild adhesive.

With a little heat, the display of the Watch4 Classic can be removed without any additional tools.

Only two types of screws are used, although the back cover screws are uncommon tri-points.

The watches are both very modular, with only the rear sensors being buried inaccessibly in the back cover.

The display of the Watch4 sits stubbornly in the frame and seems impossible to remove without damaging it.