How to check your iPhone battery health and limit charging to 80%
The battery is the part of a phone that wears out first. Your iPhone has built-in tools that show its health and help protect it.
## 1. Check battery health
Go to Settings › Battery › Battery Health & Charging. Maximum Capacity shows how much capacity is left compared with when it was new.
## 2. When should you replace it?
If Maximum Capacity drops below 80% or a "Service" message appears, the battery drains faster and the phone can feel slower. That's a good time for a new battery.
## 3. Turn on Optimized Charging
In the same place, turn on Optimized Battery Charging. Your iPhone learns your routine and waits to charge past 80% until you need it.
## 4. Limit charging to 80% (iPhone 15 and later)
On iPhone 15 and newer you can choose a Limit so charging always stops at 80% — great if you charge overnight.
## 5. Avoid heat
Heat ages a battery fastest. Don't leave your phone in a hot car, and avoid heavy games while charging.
Want your battery checked or replaced? Visit Sensok Phone — the check is free.
Source: Apple iPhone User Guide — https://support.apple.com/guide/iphone/welcome/ios