if you have AppleCare+ and your battery capacity has dropped below 80%.
Retailers like iFixit offer high-quality battery kits for older models that Apple might not support for DIY. These kits typically average around $40 to $55 . 3. Third-Party Repair Shops can you buy a new battery for an iphone
You can book an appointment at the Apple Support Page or through the Apple Support app. They usually finish the swap in about 1–3 hours. if you have AppleCare+ and your battery capacity