1. First, remove the shell. There will be some screws or buckles on the shell, which need to be removed with corresponding tools.

2. Secondly, remove the circuit board and use tweezers and other tools to remove the connecting wires on the circuit board one by one.

3. Then replace the battery or repair it. After removing the circuit board, the battery can be replaced or repaired.

4. Finally, reassemble. When replacing or repairing the battery, it is necessary to operate in the reverse order of disassembly, and assemble the circuit board and the shell one by one.