How to Check iPhone Battery Health: A 2026 Guide

Your iPhone was lasting all day a year ago, and now it begs for a charger by dinner. Before you buy a new phone or a bulky battery case, you should learn how to check iPhone battery health. Apple built a battery health report right into Settings, and it takes about thirty seconds to read. That one screen tells you how worn your battery is, whether your phone is throttling itself, and whether a battery replacement makes more sense than an upgrade.

The path to the report changed a couple of times over the years, and it looks different depending on whether you own an iPhone 15 or something older. This guide walks through every version, explains what the numbers actually mean, and gives you a clear rule for when to replace the battery.

How to Check iPhone Battery Health on iPhone 15 and Newer

If you own an iPhone 15, 16, or 17, Apple split the battery health screen into its own menu. Here is what to do:

1. Open the Settings app.
2. Tap Battery.
3. Tap Battery Health.

Your Maximum Capacity percentage sits right at the top. Below it, you will also see the cycle count, the manufacture date, and the date of first use. Apple added these extras starting with the iPhone 15 lineup, and repair technicians love them because the cycle count tells the true story of how hard a battery has worked.

If you want to slow down future wear, check the separate Charging menu under Battery. On iPhone 15 and later you can set an 80% charge limit, which keeps the battery in its healthiest zone when you charge overnight. If your battery is already losing steam during the day, our guide on why your iPhone battery drains so fast covers the 12 fixes that actually help.

How to Check iPhone Battery Health on iPhone 14 and Older

On an iPhone 14 or anything older, the menu is combined with the charging settings. The steps:

1. Open the Settings app.
2. Scroll down and tap Battery.
3. Tap Battery Health & Charging.
4. Read the percentage next to Maximum Capacity.

On these older models you will not see a cycle count, but you do get the Peak Performance Capability message, which matters just as much. Make sure Optimized Battery Charging is switched on in the same screen. It learns your daily routine and waits to finish charging past 80% until shortly before you usually unplug, which reduces chemical aging over months of overnight charging.

What the Maximum Capacity Percentage Really Means

Maximum Capacity is your battery’s current full-charge capacity compared to when the phone was brand new. A battery showing 87% holds 87% of the energy it held on day one. In practice:

• 95% to 100%: Excellent. Normal for the first year of use.
• 85% to 94%: Good. Typical for one to two years of daily charging.
• 80% to 84%: Fair. You will notice shorter battery life; start watching it.
• Below 80%: Degraded. Apple itself recommends a battery replacement at this point.

Two identical iPhones can age very differently. A phone that sat in a hot car all summer or lived on a fast charger will wear faster than one charged gently at night. iPhone 15 models are designed to keep 80% of their capacity after 1,000 complete charge cycles, while iPhone 14 and earlier models are rated for 80% after 500 cycles.

Understanding Peak Performance Capability

Below the capacity number sits the Peak Performance Capability message. Most of the time it reads that your battery is supporting normal peak performance, which means iOS is not holding your processor back.

When a battery gets too degraded, it cannot deliver power fast enough for demanding tasks. To prevent surprise shutdowns, iOS quietly slows the processor. You might see a message saying your battery’s health is significantly degraded, or that the phone experienced an unexpected shutdown. If you spot either, the battery is not just worn, it is actively affecting how your phone behaves. There is also a blunt message about being unable to verify a genuine Apple battery, which shows up on phones repaired with third-party batteries.

When Should You Replace Your iPhone Battery?

The honest answer: consider a replacement when Maximum Capacity drops below 80%, or when you see a degraded battery warning, or when the phone shuts down with charge still showing. Below that 80% line you will notice the phone dying mid-afternoon, charging to 100% and draining fast, and occasional reboots when you open the camera or a game.

Apple’s out-of-warranty battery prices in the US have crept up in recent years: expect around $99 for iPhone 14 and 15 models, about $89 for iPhone 13 through iPhone X, and roughly $69 for the iPhone SE and iPhone 8 and earlier. With AppleCare+, a battery that cannot hold more than 80% is replaced at no charge. A third-party shop usually costs less, but be aware that Apple may then refuse to show you battery health data for that phone, since the genuine-battery check will fail.

How to Slow Down Battery Wear Going Forward

Every lithium-ion battery ages; that is chemistry, not a defect. But a few habits genuinely slow the process:

• Use the 80% charge limit on iPhone 15 and later, or Optimized Battery Charging on older models.
• Keep the phone cool. Heat is the fastest battery killer. Do not leave it in a hot car or under a pillow while charging.
• Avoid full overnight fast charging when you can. Slower charging generates less heat.
• Do not fear the 20 to 80% zone. Batteries are happiest in the middle, not pinned at 100% or drained to zero.
• Update iOS. Apple keeps tuning power management; our iPhone settings guide also walks through other useful iOS tweaks that reduce battery strain.

Frequently Asked Questions

Is 85% iPhone battery health good?

Yes. A battery at 85% is normal for roughly one to two years of use and your phone should still perform normally. Keep an eye on it, and start thinking about a replacement when it approaches 80%.

How many charge cycles does an iPhone battery last?

iPhone 15 and later models are designed to retain 80% of their original capacity at 1,000 complete charge cycles. iPhone 14 and earlier models are designed to hold 80% at 500 cycles. A cycle counts any time you use 100% of capacity, even spread across multiple partial charges.

Why can’t I see the cycle count on my iPhone?

Cycle count, manufacture date, and first use date only appear on iPhone 15 and newer models, in Settings, then Battery, then Battery Health. Older models show only Maximum Capacity and Peak Performance Capability.

Does a low battery health slow down my iPhone?

It can. When a degraded battery cannot deliver enough peak power, iOS reduces processor speed to prevent unexpected shutdowns. This is exactly what the Peak Performance Capability message warns you about.

Conclusion

Checking your iPhone battery health takes less time than brewing coffee: Settings, Battery, then Battery Health (or Battery Health & Charging on older models). Read the Maximum Capacity number, glance at the Peak Performance Capability message, and you will know whether your battery is fine, worth watching, or due for a replacement. Above 80% you can relax and focus on good charging habits. Below it, a battery replacement costs a fraction of a new phone and usually restores a day of real battery life. And if a dying battery is not your actual problem, start with our connection troubleshooting guides to rule out software issues first.