Where can I change the stereo battery if it is broken?

Service center or professional repair shop.

When the audio battery is damaged, it is best to send it to the official service center or professional repair shop for replacement. These places have experienced technicians and suitable tools to ensure correct battery replacement and maintain the integrity of the equipment. Official service centers or professional repair shops usually provide genuine spare parts to ensure the quality and compatibility of batteries. Before replacing the battery, it is recommended to contact the service center or repair shop to understand their service policies, fees and schedules, so as to better arrange maintenance.