The Samsung Galaxy S9 earns a 4 out of 10 on our repairability scale (10 is the easiest to repair):

Many components are modular and can be replaced independently.

The battery replacement is technically possible, but accessing it is an unnecessary challenge.

Glued-down glass both front and back means greater risk of breakage, and makes repairs difficult to start.

Screen repairs require a lot of disassembly while battling tough adhesive.