Xiaomi Mi A2 Battery Replacement

Swollen batteries can be hazardous; exercise caution when handling them.

Verify that the phone is not simply dead: attempt power-on first.
If your Xiaomi Mi A2 won't turn on, follow troubleshooting steps before considering a new battery.

Do not heat the phone when handling a swollen battery.

Use isopropyl alcohol (90+%) to weaken adhesive: inject around back cover edges with a dropper or syringe, if needed.

Wear eye protection and exercise caution when working with a swollen battery; consider professional help if unsure.

For optimal performance:

Calibrate new batteries: charge to 100%, keep charging for 2 hours, use until shutdown due to low power, then charge uninterrupted to 100%.

Turn off the phone.

Remove the SIM card tray from the phone.
Eject a metal object from your pocket and touch it to discharge static electricity.

Remove the two 2.7mm Pentalobe #2 screws located at the bottom of the phone.

Acquire a suction cup tool and position it near the phone's lower edge.

Pull up on the suction cup to lift the LCD Panel slightly from the phone body.
Starting from the bottom, insert a plastic opening tool into the gap between the LCD and phone, working your way around the edges.
Use the plastic opening tool in conjunction with picks to unhook clips, releasing the panel from its housing.
Rotate the phone screen downwards, placing it face down near the bottom of the device.

Remove the three 2.4mm Philips #0 screws holding the panel down.

Remove the metal bracket to access the ribbon cable connectors.
When handling the new ribbon cable, take care not to bend or fold it excessively, as this may cause damage.
Disconnect the old ribbon cable and replace it with the new one.

Use a plastic spudger to lift the battery connector ribbon cable, working under it.

Remove the screen connector ribbon cable by lifting from underneath with a plastic spudger.

Panel removal may be obstructed; proceed with caution.

Remove the two 3.8mm Phillips #0 screws securing the lower metal bracket.

Remove the loudspeaker.

Locate the three 2.4mm Phillips #0 screws, with one situated under the Xiaomi water sticker on the upper right.
Remove all four screws.

Unplug the antenna wire using a spudger tool.

Do not attempt to remove the ribbon cable while the board is still attached.

Flip the sub-board over towards the battery for access to the ribbon cable connector.
Use a spudger tool to carefully remove the ribbon cable from the connector.
The USB Connector board is now removable and can be replaced with a new unit.

Proceed with extreme caution — risk of battery damage.

Remove the battery from its housing with care.