iFixit published its Apple Watch Series 12 and Ultra 4 teardown on October 6, 2026. It gave both models repairability scores of 4 out of 10. The Series 12 improved by one point from the last base model iFixit scored; the Ultra 4 retained the score of its previous generations.
The Series 12 has a stretch-release adhesive tab that lets a repairer pull the battery adhesive free. iFixit also found a simpler display connection, replacing the earlier ZIF connector with a press connector under a bracket. These are incremental repair improvements, not a redesign that removes the need to open the display.
Both watches require screen-first access to the battery. On Series 12, replacing the display also requires removing and replacing the battery. iFixit describes the glued screen and delicate cables as repair obstacles.
The teardown reports a 2.444 watt-hour battery in Ultra 4, compared with 2.313 watt-hours in Ultra 3. The 46-millimeter Series 12 battery is 1.461 watt-hours, compared with 1.403 watt-hours in the 46-millimeter Series 11. Capacity changes alone do not establish a particular battery-life improvement.
Separately, iFixit argues that Apple's lack of Watch repair parts, dedicated service tools and manuals puts it out of compliance with right-to-repair laws in ten states. That is iFixit's legal position. The teardown is not a court ruling or a newly issued government enforcement order.
The practical finding is narrow: Series 12 offers a battery-adhesive improvement, while both products remain difficult to open and scored 4 out of 10 under iFixit's own repairability assessment.