You have three ways to replace an iPhone 12 battery

Apple will replace your iPhone 12 battery for a flat fee at any Apple Store or through mail-in service. An authorized Apple repair shop can do the same work, often faster and sometimes cheaper. You can also buy a battery kit and replace it yourself if you have steady hands and basic tools, though this voids your warranty and risks damaging the phone if something goes wrong.

The battery itself costs the same no matter which route you choose — Apple charges a fixed price for the part. What changes is labor, turnaround time, and whether you keep your warranty intact. Most people choose Apple or an authorized shop because the risk of self-repair outweighs the small savings.

Key Takeaways

  • Apple charges a set fee for battery replacement at any Apple Store, and the work usually takes one to two hours if you book an appointment.
  • Authorized Apple repair shops often have shorter wait times than Apple Stores and may charge the same or slightly less.
  • Self-replacement requires a heat gun, pentalobe screwdriver, and adhesive strips, and will void your AppleCare+ coverage if you have it.
  • Your iPhone 12 battery is glued in place, so removal requires heating the phone to soften the adhesive without cracking the screen.
  • If your phone is still under warranty or AppleCare+, Apple will replace the battery at no cost if the battery health has degraded below 80 percent.

Getting a replacement through Apple or an authorized shop

Start by checking your battery health in Settings > Battery > Battery Health & Charging. If the maximum capacity is below 80 percent, Apple will replace the battery for free under warranty or AppleCare+. If it is above 80 percent, you will pay the standard out-of-warranty fee, which varies by region but is typically between $50 and $70 in the United States.

Book an appointment at apple.com or call your nearest Apple Store. Tell them you need a battery replacement and ask how long the wait is — if the store is busy, you may be able to mail your phone to Apple instead. Mail-in service takes five to seven business days total, including shipping both ways. In-store service usually takes one to two hours if you have an appointment.

Bring your phone and a form of ID. Apple will run a diagnostic to confirm the battery is the problem, then replace it while you wait or hold your phone for the appointment slot. Your data stays on the phone — Apple does not erase it for a battery replacement.

Finding an authorized repair shop

Authorized Apple repair shops are independent businesses that use genuine Apple parts and follow Apple's repair standards. They often have shorter wait times than Apple Stores because they handle fewer customers. Search "authorized Apple repair near me" or visit apple.com/repair to find shops in your area.

Call ahead and ask the price — it should match Apple's standard fee, though some shops charge slightly less or more depending on location and demand. Ask how long the replacement takes. Many shops can do it the same day if you drop off your phone in the morning. Confirm that they use genuine Apple batteries, not third-party replacements, because third-party batteries may not report their health accurately to iOS.

Replacing the battery yourself

Self-replacement is possible but carries real risks. The iPhone 12 battery is glued to the phone's frame with strong adhesive, so you must heat the phone to around 80 degrees Celsius (176 degrees Fahrenheit) to soften the glue without cracking the screen. If you explore too much heat or pry too hard, you can break the display, damage the logic board, or puncture the battery itself.

You will need a heat gun or heat pad, a pentalobe screwdriver (size P2), plastic pry tools, tweezers, isopropyl alcohol, and adhesive strips to re-seal the phone. A battery replacement kit from a reputable seller includes most of these tools and costs $30 to $50. iFixit and similar sites sell kits with detailed photo guides.

The process takes one to three hours if you have done it before, and longer if you have not. You must remove the screen first, which is the hardest step — the display is also glued in place. Once the screen is off, you can access the battery connector and peel out the old battery. After installing the new one, you reassemble the phone and re-explore adhesive strips to seal it.

Self-repair voids your AppleCare+ coverage and any remaining manufacturer warranty. If something breaks during the repair, Apple will not fix it for free. If the battery itself is defective, you have no recourse through Apple.

What to expect after replacement

A new battery should show 100 percent maximum capacity in Settings > Battery > Battery Health & Charging. iOS may take a few hours to calibrate the new battery and display the correct percentage. Do not be alarmed if it shows 99 percent for the first day — this is normal.

Your phone will feel noticeably faster and last longer on a single charge. If you had performance throttling turned on (which iOS enables automatically when battery health is very low), your phone will run at full speed again. You can turn off throttling manually in Settings > Battery > Battery Health & Charging if you prefer maximum performance over battery longevity, though Apple does not recommend this.

When to replace the battery versus replacing the phone

If your iPhone 12 is otherwise working well and you plan to keep it for another year or two, battery replacement makes sense. A new battery costs $50 to $70 and restores the phone to nearly new condition. If the phone has other problems — a cracked screen, water damage, or a failing logic board — those repairs may cost more than the phone is worth, and you should consider replacing the phone instead.

Check the current resale value of an iPhone 12 in good condition. If it is less than $200, a battery replacement is a good investment. If it is more than $400, you may want to sell the phone and buy a newer model instead. The break-even point depends on your budget and how long you plan to keep the phone.

Frequently Asked Questions

How long does an iPhone 12 battery last before it needs replacement?

Apple designs the iPhone 12 battery to retain 80 percent of its capacity after 500 full charge cycles. In real use, this typically means two to three years before the battery noticeably degrades. Heavy users who charge their phone multiple times per day may need replacement sooner. Light users may go four years or more.

Can I replace just the battery, or do I have to replace the screen too?

You can replace just the battery without touching the screen. However, you must remove the screen to access the battery, so if the screen is already cracked or damaged, you may want to replace both at once. Ask the repair shop whether they recommend this based on the condition of your phone.

Will Apple replace my battery for free if I have AppleCare+?

Yes, if your battery health is below 80 percent. AppleCare+ covers battery replacement at no cost as long as the degradation is not due to physical damage. If you dropped the phone and the battery failed as a result, Apple may charge you the standard fee or the full AppleCare+ deductible depending on the damage.

What happens to my data when I get a battery replacement?

Your data stays on the phone. Apple does not erase anything for a battery replacement. Your photos, messages, apps, and settings will all be there when you pick up the phone. If you are worried about data loss, back up your phone to iCloud before the appointment anyway.

Is it safe to use my iPhone 12 while the battery is degraded?

Yes, it is safe. A degraded battery will not catch fire or damage the phone. It will straightforward hold less charge and may cause iOS to throttle performance to prevent unexpected shutdowns. You can use the phone normally until you replace the battery — there is no danger in waiting.