You cannot replace the battery yourself—Apple Watch batteries are sealed inside and require professional service

Apple Watch batteries are glued and soldered into the device, not user-replaceable like phone batteries once were. Opening the case yourself will damage the watch and void any warranty. Instead, you have two paths: send the watch to Apple for a battery replacement, or visit an Apple Store in person. Both routes cost money, take time, and require you to be without the watch for at least a few days.

The battery itself is tiny—typically between 200 and 400 milliamp-hours depending on the model—and lasts roughly 18 months to three years of daily use before it stops holding a charge through a full day. When that happens, replacement is the only real fix. Trying to extend battery life through settings changes can help, but it cannot reverse a worn-out battery.

Key Takeaways

  • Apple Watch batteries are permanently sealed inside the case and cannot be removed or replaced at home without destroying the device.
  • Battery replacement service costs between $70 and $100 depending on the watch model, plus shipping if you mail it in.
  • You can request service through Apple's website, by mail, or by walking into an Apple Store; in-store service is usually fastest.
  • The repair takes three to five business days if you mail the watch, or one to two hours if you use an Apple Store appointment.
  • If your watch is still under warranty or covered by AppleCare+, the cost may be reduced or waived depending on the damage history.

How to Request Battery Replacement Through Apple

Start by visiting support.apple.com and selecting "Service and Repair" from the menu. Choose your Apple Watch model and describe the battery issue—that it no longer holds a charge through a full day, for example. Apple will then show you two options: mail-in service or an in-store appointment at a nearby Apple Store.

For mail-in service, you will print a prepaid shipping label, pack the watch in a box, and drop it at a carrier location. Apple receives it, runs diagnostics to confirm the battery is the problem, and replaces it. The whole process takes about a week from the moment you drop it off. You will receive an email when the watch ships back to you.

For in-store service, open the Apple Store app or visit apple.com, find your nearest location, and book a Genius Bar appointment. Bring the watch and its charger. A technician will test the battery in front of you, confirm it needs replacement, and usually complete the work while you wait—typically one to two hours. Some stores can do it faster during slow periods.

What the Battery Replacement Costs

Out-of-warranty battery replacement costs between $70 and $100, depending on which Apple Watch model you own. Older models like the Series 3 cost less; newer models like the Ultra cost more. This is the price whether you mail it in or visit a store.

If your watch is still under the one-year limited warranty that comes with purchase, battery replacement is free if the battery is genuinely defective—meaning it fails to hold a charge through normal use. However, if the battery degraded from normal wear over two or three years, that is not covered as a defect.

If you purchased AppleCare+ when you bought the watch, battery service is covered at no cost as long as the plan is active. AppleCare+ also covers accidental damage like cracks or water damage, but it costs extra upfront—typically $50 to $100 depending on the model—and requires a monthly fee on some plans.

Signs Your Apple Watch Battery Needs Replacement

The clearest sign is that the watch no longer lasts a full day on a single charge, even after a full night of charging. A new Apple Watch typically runs 18 hours on a charge; as the battery ages, that window shrinks. If you are charging it twice a day or it dies by evening, the battery is likely worn out.

Another sign is that the battery percentage drops suddenly—from 50% to 10% in a few minutes—or the watch shuts off even though the battery indicator shows charge remaining. These are signs the battery can no longer deliver power reliably.

Do not confuse battery wear with software issues. If a recent software update seems to have killed your battery life, restart the watch first: hold the side button until the power-off slider appears, swipe it, wait 10 seconds, then hold the side button again to turn it back on. If battery life returns to normal, the issue was software, not the battery itself. If it does not improve after a restart and a full charge cycle, the battery is likely the problem.

How to Extend Battery Life While You Wait for Service

If your battery is failing but you cannot get a service appointment when ready, you can stretch the charge through settings. Open the Watch app on your paired iPhone, go to Battery, and turn on Low Power Mode. This reduces performance and disables some features, but it can add several hours to your day.

You can also disable background app refresh, turn off the always-on display, reduce screen brightness, and disable location services for apps that do not need them. These changes are temporary—you can turn them back on after the battery is replaced.

Charge the watch more often during the day. Keeping the battery between 20% and 80% charge, rather than letting it drain to 1%, can slightly slow further degradation, though it will not restore a worn battery.

What Happens During the Replacement Process

When Apple replaces the battery, a technician removes the watch case using specialized tools, disconnects the old battery, and solders in a new one. The case is then resealed with new adhesive to keep water resistance intact. This is why you cannot do it at home—the tools and training required are specific to Apple's design.

The technician will also run diagnostics before and after to confirm the new battery works and the watch holds a charge. If any other damage is found during the repair—like a cracked screen or corrosion—the technician will tell you about it and provide a separate quote for those repairs.

After replacement, the watch is tested for water resistance to may support the seal is tight. You will receive it back fully functional, and the battery should perform like a new watch for the next 18 months to three years.

Frequently Asked Questions

Can I replace the battery myself with a kit from the internet?

No. DIY battery kits exist, but using them will damage the watch and void your warranty. The case is glued shut, and prying it open breaks the water-resistant seal. Even if you manage to swap the battery, reassembling it without proper tools and adhesive will leave the watch vulnerable to water damage. Professional replacement is the only reliable option.

How long does the new battery last?

A replacement battery should last 18 months to three years, the same as the original. Battery lifespan depends on how often you charge the watch and how you use it. Heavy use—constant GPS tracking, frequent app activity—wears the battery faster than light use.

What if my watch is too old to repair?

Apple will still replace the battery in older models like the Series 3 or earlier, though parts availability can vary. If your model is no longer in production, Apple may take longer to source the battery. Call your local Apple Store or check the support website to confirm your specific model can still be serviced.

Do I lose my data when the battery is replaced?

No. Battery replacement does not erase the watch. Your apps, settings, and data remain intact. The watch is paired to your iPhone, so everything syncs back after repair.

Can I use my watch while waiting for a battery replacement appointment?

Yes, you can keep using it, but you will need to charge it more often. If the battery is severely degraded, you may want to enable Low Power Mode to avoid the watch dying unexpectedly during the day. Once you have a service appointment scheduled, you can use it normally right up until you drop it off or mail it in.