When replacing the battery makes financial sense

Replace your iPhone battery if the phone is less than three years old, holds a charge for a full day with normal use, and has no cracked screen or water damage. A battery replacement costs between $69 and $99 at Apple or through an authorized repair shop, depending on your model. That is far cheaper than a new iPhone, which starts at $799. If your phone still does what you need it to do except for the battery, replacement is the right move.

The math changes if your phone is older than four years, the battery is severely degraded (showing 20 percent capacity or less), or you have been wanting a newer model anyway. At that point, the battery replacement extends the life of aging hardware, but you may spend $80 to $100 only to face other repairs within a year or two. A cracked screen, a failing speaker, or a malfunctioning camera often follows battery failure in older phones.

Check your battery health before you decide. On any iPhone with iOS 16 or later, go to Settings, then Battery, then Battery Health & Charging. The number shown as "Maximum Capacity" tells you how much of the original battery charge your phone can hold now. If it is above 80 percent, your battery is still serviceable. If it is between 60 and 80 percent, replacement will noticeably improve daily use. Below 60 percent, the phone will struggle to run demanding apps and may shut down unexpectedly even when the battery shows charge remaining.

Key Takeaways

  • Check your battery's maximum capacity in Settings to know whether replacement will actually solve your problem.
  • Battery replacement at Apple or an authorized shop costs $69 to $99 and makes sense if your phone is under three years old and otherwise works well.
  • If your phone is over four years old or has other damage, the cost of battery replacement plus likely future repairs may exceed the cost of a used phone in good condition.
  • Third-party repair shops charge less than Apple but may use non-original batteries that degrade faster and void your warranty.

What battery capacity numbers actually mean

Maximum Capacity is the percentage of the original battery charge your phone can now hold. An iPhone 14 shipped with a battery rated at 3,279 mAh (milliamp-hours). If your phone shows 85 percent maximum capacity, it can now hold about 2,787 mAh — still enough for a full day of typical use, but noticeably less than when new.

Apple considers any iPhone with 80 percent or higher maximum capacity to be in normal condition. Between 80 and 60 percent, you will notice the phone drains faster and may need charging twice a day. Below 60 percent, the phone may shut down suddenly when you try to use the camera, play video, or run multiple apps at once. This is not a malfunction — it is the phone protecting the battery from damage by cutting power when demand spikes.

The second number shown in Battery Health, "Cycle Count," tells you how many complete charge cycles your battery has completed. One cycle means you drained the battery from 100 percent to zero and charged it back to 100 percent. A phone used normally accumulates about 300 to 400 cycles per year. Most iPhone batteries are rated for 500 cycles before they drop below 80 percent capacity. If your phone shows 800 cycles and 70 percent capacity, the battery has aged roughly as expected.

Apple store replacement versus third-party repair shops

Apple charges $69 for an iPhone 11 or earlier, $79 for an iPhone 12 through 14, and $99 for an iPhone 15 or 16. The replacement uses an original Apple battery, includes a one-year warranty on the battery itself, and does not void your phone's overall warranty. The repair usually takes one to two hours if you book an appointment in advance. Walk-in service may require a longer wait, especially at busy locations.

Authorized third-party repair shops — look for the "Apple Authorized Service Provider" badge — charge the same or slightly less and offer the same warranty. The difference is mainly convenience: some shops have faster turnaround or longer hours than your nearest Apple Store.

Independent repair shops not authorized by Apple typically charge $40 to $60 for battery replacement. They may use refurbished original batteries, aftermarket batteries made to Apple's specifications, or cheaper batteries that degrade faster. A cheap battery may show 100 percent capacity when new but drop to 80 percent within six months. Replacing the battery at an unauthorized shop does not automatically void your warranty, but Apple may refuse to service other problems if they determine the unauthorized repair caused damage.

How long a new battery will actually last

A new original Apple battery will hold 80 percent or more of its capacity for about two years of normal use — roughly 500 to 600 charge cycles. After that, it will degrade gradually. Most people notice the difference around the three-year mark, when the phone may need charging every evening instead of every other day.

Your actual battery life depends on how you charge and use the phone. Leaving the phone plugged in overnight every night, or letting it drain to zero regularly, both shorten battery life. Keeping the phone between 20 and 80 percent charged, charging slowly rather than fast, and avoiding heat all extend it. If you replace the battery and then change your charging habits, you may get three years or more from the new battery. If you keep the same habits that wore out the first battery, the replacement will degrade on a similar timeline.

When to replace the battery instead of upgrading

Keep your current phone and replace the battery if: the phone is less than three years old, the screen is uncracked and the phone has never been water-damaged, you do not need features in newer models (like a better camera or faster processor), and the phone still runs the apps you use most. This is the cheapest option and keeps a working device out of the landfill.

Battery replacement is also the right choice if you are waiting for a specific new model to launch. Replacing the battery now extends the life of your current phone by a year or two, giving you time to save money or wait for the next generation.

When to buy a used phone instead of replacing the battery

Consider a used phone instead of battery replacement if your current phone is over four years old, has visible damage beyond the battery, or has other problems like a failing speaker or unresponsive screen. A used iPhone 12 or 13 in good condition costs $300 to $500 and will receive software updates for several more years. Spending $80 to replace the battery in a six-year-old phone, only to face a $200 screen repair six months later, is a worse deal.

Buy used from a reputable seller: carrier stores like Verizon or AT&T, certified refurbisher programs like Apple's own refurbished section, or marketplaces with buyer protection like eBay or Swappa. Avoid private sellers unless you can test the phone in person and verify the IMEI number is not blacklisted. A blacklisted phone cannot connect to cellular networks, even if the hardware works fine.

What happens if you ignore a degraded battery

A phone with a severely degraded battery will not suddenly stop working, but it will become increasingly unreliable. The phone may shut down at 20 percent battery, drain from 50 to zero in an hour, or refuse to run demanding apps. You will find yourself carrying a charger constantly and unable to use the phone away from power for more than a few hours.

The phone itself is not damaged by a bad battery — replacing the battery will restore normal function. But the longer you wait, the more likely other components will fail. A phone that is four or five years old and has a bad battery often has other wear: the screen may have dead pixels, the speaker may crackle, or the charging port may be loose. These problems do not cause each other, but they accumulate with age.

Frequently Asked Questions

Can I replace an iPhone battery myself?

You can, but it is not recommended. Opening an iPhone requires special tools, and the battery is glued in place. Prying it out risks damaging the screen or the logic board. If something goes wrong, you have voided the warranty and may have an unrepairable phone. The $69 to $99 Apple charges is worth the certainty that the job is done correctly.

Will a new battery make my old iPhone feel faster?

No. A new battery will not improve processor speed or app performance. It will only restore the phone's ability to hold a charge and run at full power without shutting down. If your phone feels slow, the problem is the processor or storage, not the battery. A new battery will not fix that.

How do I know if my battery is the problem or something else?

Check the maximum capacity in Settings. If it is above 80 percent and the phone still drains quickly, the problem is likely a background app, a location service, or a display setting, not the battery. If it is below 60 percent, the battery is almost certainly the culprit. You can also check which apps use the most battery in Settings under Battery.

Does Apple replace batteries for free under warranty?

Apple replaces batteries for free only if the phone is within one year of purchase and the battery has degraded to below 50 percent capacity due to a manufacturing defect. Normal battery degradation is not covered. If your phone is out of warranty, you pay the standard replacement fee.

What is the difference between a refurbished battery and a new one?

A refurbished battery has been used before, tested, and restored to working condition. It may not hold quite as much charge as a new battery and may not last as long. Apple's refurbished batteries come with the same warranty as new ones. Refurbished batteries from third-party shops vary in quality and warranty coverage.