My iPhone battery drains very quickly

When was the last time that you replaced the battery?

What is the current Maximum Capacity of the battery?

Settings > Battery > Battery Health & Charging > Maximum Capacity

If the Max Capacity is under 80%, you need to have the battery replaced at the Apple Store or an authorized Apple service shop. $69 (U.S.)

You can find a list of authorized shops in the your area using this link: Find Locations

cheah32 wrote:

my iphone 7 is bought on 2020 year

it will drain very fast 2 hour 20 percent or 30 percent of battery run off

any idea solve this

Check the battery health, and if at 80% or lower, contact Apple or an authorized dealer to arrange a battery replacement.