The battery is inside your iPhone — you cannot access it without opening the phone

Your iPhone's battery is a sealed component built into the phone's interior. Apple does not design iPhones to let you remove or replace the battery yourself. The battery sits behind the screen and internal components, so you cannot see it or reach it without disassembling the phone.

If your battery is failing, you have two real options: take the phone to Apple or an authorized repair shop, or replace the phone itself. You cannot buy a replacement battery and swap it in at home the way you might with older phones or some Android devices.

Key Takeaways

  • Your iPhone battery is sealed inside the phone and cannot be removed or replaced by the user.
  • You can check your battery's current health percentage in Settings > Battery > Battery Health & Charging without opening the phone.
  • If your battery health drops below 80 percent, Apple will replace it for a fee, or for free if your phone is under warranty.
  • Apple Stores and authorized repair shops are the only places that can legally replace an iPhone battery without voiding your warranty.

How to check your battery health without opening the phone

Open Settings on your iPhone. Tap Battery, then tap Battery Health & Charging. You will see a percentage labeled "Maximum Capacity" — this is your battery's current health. A new iPhone battery shows 100 percent. Over time and with use, this number drops.

Below the percentage, you may also see a "Condition" line. If your battery is in good shape, it says "Normal." If the battery is degraded, it might say "Service Recommended" or "Service Battery." When you see "Service Recommended," the battery still works, but Apple is telling you it has worn down enough that replacement would improve performance.

This screen also shows your charging habits. You will see "Charging Optimization" and information about whether your phone is using optimized charging to slow battery wear. This feature learns when you usually charge your phone and slows the charging speed after 80 percent to extend the battery's lifespan.

What battery health percentage means for your phone

A battery at 100 percent capacity holds a full charge and delivers normal performance. At 90 percent, you probably will not notice any difference in how long your phone lasts between charges. Most people do not worry about battery health until it drops below 80 percent.

At 80 percent capacity, your phone still works normally, but the battery cannot hold as much charge as it did when new. If you used to get a full day of use, you might now get 16 to 20 hours. At 70 percent or lower, the difference becomes obvious — your phone may shut down unexpectedly even when the battery percentage shows 20 or 30 percent remaining.

Battery health degrades naturally over time. Every time you charge your phone, the battery loses a tiny amount of capacity. After 500 full charge cycles (a full charge cycle means draining the battery completely and charging it back to 100 percent), most iPhone batteries have dropped to around 80 percent health. After 1,000 cycles, they typically sit around 60 to 70 percent.

When to replace your battery

If your battery health is above 80 percent and your phone lasts a full day on a charge, you do not need to replace it yet. Keep using it. Battery replacement is not urgent unless the phone is shutting down unexpectedly or you cannot get through a normal day without charging.

If your battery health is below 80 percent and you want longer battery life, Apple will replace the battery. The cost depends on your phone model and whether you have AppleCare+. Without AppleCare+, battery replacement typically costs between $50 and $70. With AppleCare+, it is free. If your phone is still under the standard one-year warranty and the battery failure is a defect (not normal wear), Apple replaces it for free.

If your phone is shutting down unexpectedly or restarting on its own, that is a sign the battery cannot deliver the power the phone needs. This usually happens when battery health is very low. Replacement will fix this problem.

Where to get your battery replaced

Apple Stores will replace your battery. You can make an appointment through the Apple Support app or the Apple website. Bring your phone and your Apple ID password. The appointment usually takes 1 to 2 hours, though it can take longer if the store is busy.

Authorized Apple Service Providers — shops that Apple has certified to do repairs — can also replace your battery. These are often smaller repair shops, Best Buy Geek Squad locations, or carrier stores like Verizon or AT&T. Call ahead to confirm they have your battery in stock and to ask about wait times.

Third-party repair shops can replace your battery too, and they are often faster and cheaper than Apple. However, using a non-Apple repair shop may void your warranty. If your phone is still under warranty or AppleCare+, stick with Apple or an authorized provider to keep your coverage intact.

How to slow down battery wear while you still have good health

Enable Optimized Battery Charging in Settings > Battery > Battery Health & Charging. This feature learns when you charge your phone and slows charging to 80 percent until you need the full charge. It then charges the remaining 20 percent closer to when you wake up or use the phone. This reduces the time your battery spends at 100 percent, which slows degradation.

Keep your phone cool. Heat damages batteries faster than anything else. Avoid leaving your phone in direct sunlight, in a hot car, or in a case while charging if the phone gets warm. If your phone feels hot during normal use, close apps and let it cool down.

Avoid letting your battery drain completely very often. Charging from 20 percent to 80 percent is gentler on the battery than draining it to 0 percent and charging to 100 percent. If you use your phone normally and charge it overnight, you are already doing this.

Frequently Asked Questions

Can I replace my iPhone battery myself?

Not without opening the phone, which requires special tools and voids your warranty. Apple designs iPhones to be difficult to open. If you try and damage something else inside, Apple will not cover it. Use an Apple Store or authorized repair shop instead.

How long does an iPhone battery last before it needs replacement?

Most iPhone batteries reach 80 percent health after 2 to 3 years of normal use. This depends on how often you charge, how hot your phone gets, and how much you use it. Some people need a replacement after 18 months; others go 4 years without noticing a problem.

Will my data be erased if I replace the battery?

No. Battery replacement does not touch your data. Your photos, messages, apps, and settings stay on the phone. Apple backs up your phone during the repair process anyway, so your information is protected.

Is it worth replacing the battery or should I just buy a new phone?

If your phone is less than 3 years old and works well otherwise, battery replacement is worth it. A $60 battery replacement extends the phone's life by 2 to 3 more years. If your phone is 5 years old or older, or if other hardware is failing, a new phone may make more sense financially.