iPhone 7plus. Update 15.7.2 battery drain FAST

Hi there!

If the battery on your iPhone is draining faster than expected, the first thing we would recommend is checking your battery health under Settings > Battery > Battery Health. Per iPhone Battery and Performance:

The Battery Health screen includes information on maximum battery capacity and peak performance capability. 

Maximum battery capacity measures the device battery capacity relative to when it was new. A battery will have lower capacity as the battery chemically ages which may result in fewer hours of usage between charges. Depending upon the length of time between when the iPhone was made and when it is activated, your battery capacity may show as slightly less than 100%.

A normal battery is designed to retain up to 80% of its original capacity at 500 complete charge cycles when operating under normal conditions. The one-year warranty includes service coverage for a defective battery. If it is out of warranty, Apple offers battery service for a charge. Learn more about charge cycles.

If your battery health is above 80% and you do not have a message about the condition of your battery in that area, then let's next make sure that your settings are adjusted so that you’re getting the maximum life out of your battery. There are some great tips for that on this page: Batteries - Maximizing Performance - Apple

Once you’ve implemented those tips, charge your iPhone fully and use it as you normally would over the next few days.

We hope that helps!