Battery
My battery is draining so quickly after I update my iOS to 16.3 version keep in mind that my iPhone is 13 pro max
iPhone 13 Pro Max
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Hello,
With any new version of iOS there are always maintenance and re-indexing tasks to be performed. It should settle down in a few days. These are the standard steps for short battery life:
1) Have you tried a restart? If not, do it now.
2) Go to Settings > Battery > BATTERY USAGE BY APP to see the apps that are consuming your battery.
3) Check “Battery Health” in the link:
iPhone Battery and Performance
Good luck.