Battery drain and over heating
I updated my iPhone to 15.2 and I have been experiencing shortened battery life and overheating. What can be done to fix this issue.
iPad Pro, iPadOS 15
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That depends on what type of iPhone you use.
For an older type iPhone (> 6 years) ), which also affects the battery life, that may be the cause of the problem.
Consider getting the battery replaced.
A software update does not extend the battery life.
The battery can be replaced by Apple or an Apple Authorized Service Provider.
See this Apple article: https://support.apple.com/iphone/repair/service/battery-power
If you are going to replace the battery, read this Apple article: Get your iPhone, iPad, or iPod touch ready for service