How to better the iPhone?
My phone is so fast to low battery any recommendations?
iPhone 7, iOS 15
iPhone 7
1.
Please check -> iPhone 7 Repair Program for "No Service" Issues
iPhone 7 Repair Program for "No Service" Issues - Apple Support
2.
iPhone 7 is > 6 years old, which also affects the battery life. The hardware remains old, so does the battery.
If it is still possible, have the battery replaced.
The battery can be replaced by Apple or an Apple Authorized Service Provider.
See this Apple article: iPhone Battery Repair & Replacement - Apple Support
If you are going to replace the battery, see -> Get your iPhone, iPad, or iPod touch ready for service
Get your iPhone, iPad, or iPod touch ready for service - Apple Support
The price is approx $ 69.
If you want to know exactly, call Apple directly, see Contact Apple for support and service -> Contact Apple for support and service – Apple Support (UK)
or
call 1-800-MY-APPLE
3.
See -> The last update killed my battery! -> The last update killed my battery! - Apple Community