How to turn off background refresh on your phone so that the charge lasts longer AND longer

Greetings Pyotr Sargsyan,

You can learn how to get the most from your iPhone battery by following the guidance found here:

Batteries - Maximizing Performance - Apple

"Background Activity. This indicates that the battery was used by the app while it was in the background — that is, while you were using another app.

• To improve battery life, you can turn off the feature that allows apps to refresh in the background. Go to Settings > General > Background App Refresh and select Wi-Fi, Wi-Fi & Cellular Data, or Off to turn off Background App Refresh entirely.
• If the Mail app lists Background Activity, you can choose to fetch data manually or increase the fetch interval. Go to Settings > Accounts & Passwords > Fetch New Data."

Take care.