Replace the battery if the phone is less than four years old and the battery health has dropped below 80 percent

A battery replacement costs between $69 and $99 depending on your iPhone model, while a new phone costs $800 to $1,200. If your phone still runs the apps you need, holds a charge long enough for a full day with moderate use, and has no cracked screen or water damage, replacing the battery almost always makes financial sense. Apple's battery replacement service takes three to five business days at most locations, or you can use an authorized third-party repair shop to get it done faster.

The decision becomes clearer when you check your battery health. Go to Settings > Battery > Battery Health & Charging and look at the "Maximum Capacity" number. If it shows 80 percent or higher, your battery is still acceptable — you may not need replacement yet. If it shows 50 to 79 percent, replacement will restore most of the phone's original performance. Below 50 percent, the phone will shut down unexpectedly even when the battery indicator shows 20 to 30 percent remaining, making replacement urgent.

Key Takeaways

  • Battery replacement costs $69 to $99 and takes three to five business days through Apple, making it far cheaper than a new phone.
  • Check your battery health in Settings > Battery > Battery Health & Charging; replacement makes sense if maximum capacity is below 80 percent.
  • A four-year-old iPhone with a fresh battery will perform nearly as well as a new phone for everyday tasks like messaging, email, and social media.
  • Replace the battery if the phone has no physical damage, still receives iOS updates, and runs your essential apps without constant crashes.
  • Third-party authorized repair shops often complete battery replacement in one to two days, faster than Apple's standard timeline.

What battery replacement actually restores

A new battery restores the phone's ability to hold a charge for a full day of normal use. It does not make the phone faster, improve the camera, or add new features — those depend on the processor and software. If your iPhone 11 or 12 feels slow, that slowness usually comes from the operating system or a full storage drive, not the battery. Replacing the battery will not fix either of those problems.

What replacement does fix is the shutdown problem. When battery health drops below 50 percent, iOS throttles the processor to prevent unexpected shutdowns, which makes the phone feel sluggish. A new battery removes that throttling and restores the phone's original speed. You will also stop seeing the "Low Battery" warning at 30 or 40 percent charge, and the phone will last through a full workday without needing a midday charge.

When a new phone makes more sense than battery replacement

Buy a new phone instead of replacing the battery if the screen is cracked, the phone has been water-damaged, or it is older than five years. A cracked screen costs $200 to $400 to repair, and water damage often requires multiple component replacements that add up to $300 or more. Combined with a battery replacement, you are approaching the cost of a refurbished phone, which comes with a warranty and a fresh battery already installed.

Phones older than five years may still work, but they are approaching the end of iOS support. Apple typically stops releasing security updates for iPhones after five to six years. An older phone with a new battery will still function, but it will eventually stop receiving patches for security vulnerabilities. If you keep the phone for another two years after replacement, you risk using an unsupported device.

Battery replacement through Apple versus third-party shops

Apple's official battery replacement service is available at Apple Stores and Apple Authorized Service Providers. The cost is $69 for iPhone SE and older models, $79 for iPhone 11 through 13, and $99 for iPhone 14 and newer. Turnaround is typically three to five business days. Apple also offers mail-in service if no store is nearby — you ship the phone to Apple, they replace the battery, and ship it back, which takes about a week total.

Authorized third-party shops like Best Buy's Geek Squad, Batteries Plus Bulbs, and local independent repair shops often complete replacement in one to two days and charge $50 to $85. These shops must use genuine or certified-equivalent batteries to maintain the warranty. Avoid unlicensed repair shops that advertise unusually low prices, as they may use counterfeit batteries that degrade quickly or pose safety risks. Check Google reviews and ask whether the shop uses genuine Apple batteries or certified replacements before you hand over your phone.

How long a replacement battery lasts

A new battery will retain 80 percent capacity for about two to three years with normal use. After that, the degradation rate accelerates slightly, and you may notice the phone draining faster. Most people replace their iPhone every three to four years anyway, so a new battery typically lasts until the next phone upgrade. If you plan to keep your current phone for five or more years, expect to replace the battery twice — once now and again in two to three years.

Battery lifespan depends on how you charge and use the phone. Leaving the phone plugged in overnight, exposing it to heat, or running demanding apps constantly will degrade the battery faster. Charging to 80 percent and letting it drop to 20 percent before charging again extends battery life. If you use your phone heavily for gaming, video streaming, or navigation, the battery will degrade faster than someone who uses it mainly for messaging and email.

The environmental and financial case for replacement

Replacing a battery instead of buying a new phone saves money and reduces electronic waste. Manufacturing a new phone requires mining rare minerals, assembling hundreds of components, and shipping it across the world — all of which consume energy and create emissions. A battery replacement uses a fraction of those resources. If you keep your current phone for one more year by replacing the battery, you delay the manufacturing impact of a new phone by twelve months.

From a pure cost perspective, a $79 battery replacement extends the life of an $800 phone by one to two years. That works out to $40 to $80 per year of additional use, compared to $200 to $300 per year if you buy a new phone annually. Even if you replace the battery twice before upgrading, you will spend less than $200 total on batteries while getting three to four years of use from the same device.

Signs your phone needs battery replacement soon

The most obvious sign is the battery percentage dropping from 100 to 20 percent in a few hours of light use. Another is the phone shutting down at 15 or 20 percent charge even though the battery indicator shows it should have more power. You may also notice the phone getting warm during normal tasks, which indicates the battery is working harder to deliver power. Some users see the "Low Power Mode" notification appearing earlier than it used to, or the phone asking to reduce performance to preserve battery.

If you are charging the phone twice a day just to get through work or school, battery replacement will likely solve the problem. If you are charging it three or four times a day, the battery is severely degraded and replacement is urgent. Check your battery health number first — if it is below 70 percent and you are experiencing any of these signs, schedule a replacement within the next week or two.

Frequently Asked Questions

Will replacing the battery void my warranty?

No. Apple's warranty covers battery replacement as a repair service. If you use an Apple Authorized Service Provider, the replacement battery is covered under Apple's one-year limited warranty. Third-party shops should also provide a warranty on the battery itself, typically one to two years. Always ask for a written receipt that specifies the warranty terms.

Can I replace the battery myself?

You can, but it is not recommended unless you have experience with phone repair. iPhones are sealed with adhesive, and opening one requires special tools and careful technique. A mistake can damage the screen, water-sealing gaskets, or internal components, turning a $79 repair into a $400 problem. Most people save time and risk by paying a professional.

What happens to my data when the battery is replaced?

Your data stays on the phone. Battery replacement does not erase anything. The technician removes the battery and installs a new one without touching the storage drive or other components. Back up your phone before the repair anyway, just in case something unexpected happens during the process.

Is it worth replacing the battery on an iPhone that is five years old?

Only if the phone has no other damage and you plan to use it for at least one more year. A five-year-old iPhone is approaching the end of iOS support, so you will eventually need to upgrade. If the screen is intact and the phone still runs your essential apps, a battery replacement buys you time. If the phone is already showing other problems like a cracked screen or slow performance unrelated to the battery, a new phone is the better choice.

How do I know if my battery health is accurate?

Apple's Battery Health reading is accurate within a few percentage points. If it shows 75 percent, the actual capacity is somewhere between 72 and 78 percent. The number can fluctuate slightly depending on temperature and recent usage, so check it a few times over a week to see the trend. If it is consistently below 80 percent, replacement will improve performance noticeably.