How to Check Battery Health on iPhone

Your iPhone tracks how much charge its battery can still hold compared to when it was new. The number is in Settings and takes a few taps to reach.

Open Battery settings

Open Settings and tap Battery. The top of the screen shows recent charge levels and activity; the health details are further down.

Tap Battery Health

Tap Battery Health. On some iOS versions and models the row is labeled Battery Health & Charging.

Read the Maximum Capacity percentage

Maximum Capacity compares the battery's current full charge to its original capacity. A new iPhone starts at 100 percent and the figure drops slowly with use. Under it, Peak Performance Capability reports whether the battery can still deliver full power. If the battery has degraded enough that the phone shut down unexpectedly, this section explains that performance management has been applied and offers a way to disable it.

Check the cycle count

On iPhone 15 and later, the same screen lists Cycle Count, the number of times the battery has been fully discharged and recharged, along with the manufacture date and first-use date. Earlier models do not show cycle count here.

Review the charging options

On iPhone 15 and later, Charge Limit lets you cap charging at a percentage between 80 and 100 to slow wear. On other models, Optimized Battery Charging learns your routine and waits to finish charging past 80 percent until shortly before you usually unplug. Both settings live on the Battery Health screen.

If Maximum Capacity is below 80 percent. Apple considers a battery below 80 percent to be worn and will replace it under AppleCare+ at no charge, or for a fee otherwise. Above 80 percent, the battery is considered within normal range even if it feels weaker than it once did.

If the screen says the battery needs service. A message reading that the battery's health is significantly degraded appears when the battery is worn. The phone keeps working, but battery life will be noticeably shorter until the battery is replaced.