How to get a new battery for iPhone 11 Pro Max?
How to get new battery for I Phone 11Max and how much it cost
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Hello,
Apple Care can help you with a Battery Replacement.
You will find current prices for battery replacements and more information here on this link iPhone Battery Replacement - Official Apple Support.
On the link above it is also possible to create a new service request with Apple Care. If you have an Apple Store nearby, it's of course also possible to give them a visit.