What is the cost of iPhone 7 battery in india
What is the cost of battery replacement of iPhone 7 in India
iPhone 7, iOS 14
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Call Apple in your region see: Contact Apple for support and service
https://support.apple.com/en-us/HT201232
For an indication see this Apple article: iPhone Battery & Power Repair
https://support.apple.com/iphone/repair/service/battery-power
If you are going to replace the battery, by Apple or an Apple Authorized Service Providers read this Apple article:
Get your iPhone, iPad, or iPod touch ready for service