Apple Watch SE2 2022 40mm Battery

Apple Watch SE (2nd generation) 40mm Battery: Restored Autonomy

This replacement battery is suitable for repairing the Apple Watch SE (2nd generation) 40mm with power failures. The charge accumulator restores normal operation to the smartwatch when the previous part shows significant wear or malfunction.

Technical Specifications

• Part type: Replacement battery
• Compatibility: Apple Watch SE (2nd generation) 40mm
• Compatible model reference: BAT-A2721
• Quality: Premium

When to Replace

• Apple Watch shuts down unexpectedly during use
• Reduced autonomy lasting only a few hours
• Device only turns on when connected to the magnetic charger
• Swollen battery lifting the watch screen
• Watch does not charge or bootloops — confirm diagnosis

Notes for the Technician

• Test before applying: connect the battery without adhering it and confirm that the device boots, charges, and displays the percentage correctly. Thus, if there is any issue, the return or warranty is handled quickly and simply.
• Intervention difficulty: Advanced.
• Mandatory front opening via heating and careful removal of the screen.
• High risk of damaging the sensitive flex cables connecting the screen and force sensor when opening the case.
• Necessary to use proper sealant or adhesive for watertight case closure, sold separately.
• Disconnect the battery connector before starting any other internal manoeuvre.

What Distinguishes This Version

This is a Premium quality part, positioned at the highest tier of the aftermarket market for this smartwatch. It is the suitable choice for technicians seeking a reliable repair with excellent charge retention performance.

Frequently Asked Questions

Is this battery compatible with the 44mm model?
No, this part is exclusively intended for the 40mm version of the 2022 Apple Watch SE.

Does the reference BAT-A2721 fit the 1st generation Apple Watch SE?
No, it was specifically designed for the internal architecture of the 2nd generation Apple Watch SE (2022).