The Xiaomi Mi Watch 2021 earns a 5 out of 10 on our repairability scale (10 is the easiest to repair):

The opening procedure is simple and glueless.

Connectors are modular and don't overly overlap.

The battery is easily accessible for repairs.

Opening requires a somewhat uncommon T2 Torx driver, but Phillips screws grace the inside.

Many components are grouped together and can’t be replaced individually.

Display removal seems impractical and repairs will probably require replacing the watch casing.