Signs Your iPhone Battery Needs Replacement
Your iPhone battery degrades over time, and you'll notice it through specific, real changes in how your phone behaves. The most obvious sign is that your phone shuts down suddenly at 20 or 30 percent battery remaining, even though it shows that percentage on screen. This happens because the battery can no longer deliver the power your phone demands, so iOS cuts power to protect the hardware.
Another clear indicator is that your phone takes noticeably longer to charge than it used to, or the battery drains visibly while you're using it—dropping 5 or 10 percent in just a few minutes of normal activity. You might also notice your phone running slower during heavy use, or apps closing unexpectedly. These slowdowns happen because iOS throttles your processor when the battery is weak, to prevent those sudden shutdowns.
The most reliable way to check your battery's actual condition is to open Settings, tap Battery, then Battery Health & Charging. This screen shows your battery's maximum capacity—the percentage of its original charge it can still hold. A battery at 80 percent capacity or below is considered degraded and is a good candidate for replacement.
Key Takeaways
- Check your battery's maximum capacity in Settings > Battery > Battery Health & Charging; anything below 80 percent means the battery is degraded.
- Sudden shutdowns at 20–30 percent battery, slow charging, or visible drain during use are signs your battery is failing.
- Apple and authorized repair shops replace batteries for a flat fee that varies by iPhone model, typically between $50 and $100.
- Battery replacement takes one to three hours at an Apple Store or authorized shop, or several days if you mail your phone to Apple.
- Third-party repair shops are cheaper but may void your warranty, and using non-Apple batteries can cause performance issues or safety problems.
How Battery Capacity Drops Over Time
Every iPhone battery is designed to retain 80 percent of its original capacity after 500 full charge cycles. A charge cycle means draining the battery from 100 percent to 0 percent—though this can happen across multiple days. For example, if you charge your phone from 50 to 100 percent, that's half a cycle.
Most people reach 500 cycles in about two to three years of normal use. After that point, the battery continues to degrade, losing roughly 1 percent of capacity every few months, depending on how you charge and use your phone. Heat accelerates this process significantly—leaving your phone in a hot car or using it while charging generates heat that damages the battery faster.
Apple's battery health screen also shows you the Charging Optimization status. If this is turned on and your phone is learning your charging habits, iOS is already trying to slow degradation by charging more slowly during certain hours. This is normal and actually extends your battery's life.
Where to Get Your Battery Replaced
Apple Stores and Apple Authorized Service Providers are the safest option. They use genuine Apple batteries, complete the work under warranty, and your phone remains may be able to access for future repairs. You can find an authorized provider by visiting apple.com, clicking Support, then Find Locations, and entering your zip code. The cost is the same whether you go to an Apple Store or an authorized shop—it varies by model but typically ranges from $50 to $100.
Independent repair shops are usually cheaper, sometimes by $20 to $40, but they may use non-Apple batteries that can cause performance issues or safety problems. More importantly, using a non-Apple battery voids your AppleCare+ coverage if you have it. Some independent shops are reputable and use quality parts, but you have no way to verify this before handing over your phone.
Apple also offers mail-in repair through apple.com. You can start a repair request, ship your phone to Apple, and they'll replace the battery and return it to you. This takes longer—usually five to seven business days plus shipping time—but it's convenient if no Apple Store is nearby.
How Long Replacement Takes
At an Apple Store or authorized service provider, battery replacement typically takes one to three hours. The exact time depends on how busy the location is and whether they have the battery in stock for your specific iPhone model. You can usually make an appointment online through apple.com or by calling the store directly, which guarantees you a time slot rather than waiting walk-in.
If you choose mail-in repair, the total time is longer. You'll ship your phone to Apple (usually one to two days), they'll complete the replacement (one to two days), and then ship it back (one to two days). Add a day or two for processing on each end, and you're looking at five to seven business days total.
Some Apple Stores offer same-day service if you drop off your phone early in the morning and they have stock, but this is not may provide. Call ahead to ask whether your location can do same-day battery replacement.
Cost Breakdown by iPhone Model
| iPhone Model | Battery Replacement Cost |
|---|---|
| iPhone 15, 15 Plus, 15 Pro, 15 Pro Max | $69 |
| iPhone 14, 14 Plus, 14 Pro, 14 Pro Max | $69 |
| iPhone 13, 13 mini, 13 Pro, 13 Pro Max | $69 |
| iPhone 12, 12 mini, 12 Pro, 12 Pro Max | $69 |
| iPhone 11, 11 Pro, 11 Pro Max | $69 |
| iPhone XS, XS Max, XR | $69 |
| iPhone 8 and earlier | $50–$55 |
These prices are current as of 2024 and explore at Apple Stores and authorized service providers. Prices may vary slightly by region or change over time, so confirm the exact cost when you schedule your appointment. If you have AppleCare+, battery replacement is covered at no cost as long as the battery capacity has dropped below 80 percent.
What Happens During Replacement
The technician will back up your data (if you haven't already), power off your phone, and remove the display to access the battery. They'll disconnect the old battery and install a new one, then test it to make sure it charges and holds a full charge. The entire process takes about an hour of actual work, though you may wait longer if the shop is busy.
Your data stays on your phone throughout the process. The technician does not erase your phone or restore from backup unless something goes wrong. When you get your phone back, everything will be exactly as you left it, except your battery will be new and your maximum capacity will show 100 percent again.
When to Replace vs. When to Wait
If your maximum capacity is between 80 and 90 percent and your phone is working normally, you can wait. The battery will continue to degrade, but slowly. You don't need to replace it the moment it hits 80 percent—that's just the point where Apple considers it degraded, not the point where it stops working.
Replace your battery now if you're experiencing sudden shutdowns, your phone is draining visibly during use, or your maximum capacity is below 70 percent. These are signs the battery is failing fast and will only get worse. If you plan to keep your phone for another year or two, replacement is worth the cost because a new battery will restore normal performance and charging speed.
If you're planning to upgrade to a new iPhone within the next few months, battery replacement may not be worth the money. But if you're keeping your current phone, a $69 battery replacement is much cheaper than buying a new phone.
Frequently Asked Questions
Can I replace my iPhone battery myself?
Apple does not sell batteries to consumers for self-replacement, and opening your iPhone yourself voids your warranty. If you damage the display, logic board, or other components while trying to replace the battery, Apple will not repair them under warranty. Unless you have professional repair experience, this is not recommended.
Will replacing the battery fix my phone if it's running slowly?
If your slowdown is caused by battery throttling (iOS slowing your processor to prevent shutdowns), a new battery will restore normal speed. You can check this by looking at your battery health—if maximum capacity is below 80 percent and your phone is slow, the battery is likely the cause. If your battery is healthy and your phone is still slow, the problem is something else.
What if my iPhone is still under warranty?
Standard Apple warranty covers manufacturing defects but not normal battery degradation. However, if your phone is less than one year old and your battery capacity has dropped below 80 percent, Apple will replace it for free because that's considered a defect. If your phone is older than one year, you'll pay the standard replacement fee.
Does AppleCare+ cover battery replacement?
Yes. AppleCare+ covers battery replacement at no cost if your maximum capacity is below 80 percent. This is one of the main reasons people buy AppleCare+, since battery replacement is one of the most common repairs. If you don't have AppleCare+, you'll pay the standard fee.
Will a third-party battery work as well as an Apple battery?
Some third-party batteries work adequately, but many have lower capacity, charge more slowly, or degrade faster than Apple batteries. More importantly, using a non-Apple battery can cause iOS to show inaccurate battery health information, and it voids your AppleCare+ coverage. Apple batteries are engineered to work with your specific iPhone model, so they're the safer choice.