IPad Pro battery has been used for five and a half years, its health is less than 80%, and its shell is sunken. Can I change it in official website?
You can call Apple's customer service and make an appointment directly after sale. You should go to the Apple after-sales service center at the appointed time and ask the staff there to replace the new battery for you free of charge. If you are late, the staff of Apple won't give you free money. You can only spend money to change it, which is about 100 yuan.