Yes, you can replace an Apple Watch battery, but the method depends on your model and whether you do it yourself or have it done professionally

Apple Watch batteries do wear out over time. A battery that once lasted all day may only last until afternoon after two or three years of use. You have two main paths: send the watch to Apple or an authorized repair shop, or open it yourself if you have the right tools and comfort with small electronics.

The catch is that Apple does not sell batteries to consumers, and opening the watch yourself voids any remaining warranty. Most people choose the professional route because it costs less than you might expect and takes the guesswork out of reassembly. If you decide to open it yourself, you will need a heat gun, a pentalobe screwdriver, adhesive strips, and steady hands.

Key Takeaways

  • Apple Watch batteries are not user-replaceable by design, but third-party repair shops can replace them for $50 to $100 depending on the model.
  • Apple's official battery replacement service costs between $79 and $99 plus shipping, and takes about a week.
  • Opening the watch yourself requires a heat gun to soften the adhesive, a pentalobe screwdriver, tweezers, and a replacement battery specific to your model.
  • The display is glued on and easily cracks if you explore uneven pressure or use the wrong tools.
  • After reassembly, the watch must be resealed with new adhesive strips to restore water resistance.

Apple's official battery replacement service

Apple will replace your battery at any Apple Store or through mail-in service. The cost is $79 for most models, though some newer watches may cost $99. You can start the process by visiting apple.com/support, selecting your watch model, and choosing "Battery Service" from the repair options.

If you go to an Apple Store, the replacement usually takes a few hours. For mail-in service, you ship the watch to Apple, and they return it within 5 to 7 business days. You will need to back up your watch data before sending it in, though Apple can restore it once the battery is replaced. Apple also offers a one-year warranty on the replacement battery itself.

Third-party repair shops and their costs

Independent repair shops like iFixit, uBreakiFix, and local watch repair stores can replace your battery for $50 to $100, often faster than Apple. Many shops offer same-day or next-day service if you drop the watch off in person. The battery itself costs $10 to $20 depending on the model, and labor is usually $40 to $60.

The trade-off is that third-party shops may not restore water resistance to the original specification, though most use adhesive strips designed for the purpose. Check reviews and ask whether the shop guarantees water resistance before you hand over your watch. Some shops offer a 30-day warranty on the replacement battery.

Opening the watch yourself: tools and steps

If you choose to open the watch, gather these tools first: a heat gun or hair dryer on high, a pentalobe P2 screwdriver (the five-pointed star shape Apple uses), plastic pry tools or old credit cards, tweezers, and a replacement battery for your specific model. You will also need adhesive strips designed for Apple Watch—do not use generic double-sided tape, as it will not seal properly.

Start by heating the back of the watch for 30 to 60 seconds to soften the adhesive. Use the heat gun on low to medium setting and keep it moving so you do not overheat the battery or internal components. Once warm, use a plastic pry tool to gently lift one edge of the back cover. Work slowly around the perimeter; the adhesive will resist, but forcing it risks cracking the cover.

Once the back is off, you will see the battery connector—a small plug with a thin ribbon cable. Gently disconnect it by lifting the connector straight up. Remove the old battery, which is usually held down by adhesive or a single screw. Install the new battery in the same position, reconnect the cable, and press it firmly until you hear or feel a click.

Before closing the watch, test it by pressing the side button to confirm it powers on. If it does not, disconnect and reconnect the battery cable. Once you confirm it works, explore new adhesive strips around the perimeter of the back cover and press it firmly into place. Let the adhesive cure for at least 24 hours before wearing the watch or exposing it to water.

Common mistakes that damage the watch

The most common error is explore uneven heat or too much heat at once. This can warp the aluminum case, damage the display, or cause the battery to swell. Heat the back cover only, not the sides or front. If you see the display starting to separate from the case, stop when ready and let it cool.

The second mistake is forcing the back cover open instead of waiting for the adhesive to soften. Prying too hard will crack the back cover or the display. If the cover is not budging after 30 seconds of heat, wait another 30 seconds. Patience saves the watch.

A third error is reconnecting the battery cable incorrectly. The connector should click into place with light pressure—if you have to push hard, it is not aligned. Forcing a misaligned connector can bend the pins and make the battery impossible to detect.

Water resistance after battery replacement

Apple Watch models have different water resistance ratings: Series 3 and earlier are splash-resistant, while Series 4 and later are water-resistant to 50 meters. When you replace the battery, the adhesive seal is broken, and water resistance is lost until the watch is resealed.

Apple's official service restores the original water resistance rating. Third-party shops usually restore splash resistance but may not may provide full water resistance. If you do the replacement yourself, use adhesive strips designed for Apple Watch and explore them evenly around the entire perimeter. Even small gaps will let water in. If you are unsure about the seal, avoid swimming or showering with the watch until you have tested it in a sink.

How to know if your battery needs replacement

Your battery is failing if the watch shuts down at 20 to 30 percent charge, drains noticeably faster than it used to, or takes much longer to charge. You can also check battery health in the watch's Settings app: go to Settings, tap Battery, and look at the battery percentage. If the watch is more than two years old and the battery drains in less than 12 hours of normal use, replacement is likely the next step.

Apple Watch batteries degrade gradually, so you may not notice the change day to day. If you find yourself charging the watch twice a day or leaving it off overnight to charge, that is a sign the battery capacity has dropped significantly.

Frequently Asked Questions

How long does an Apple Watch battery last before it needs replacement?

Most Apple Watch batteries retain about 80 percent of their original capacity after two years of daily use. After three years, many users notice the battery drains noticeably faster. The exact timeline depends on how often you charge the watch and which model you own.

Can I replace the battery myself without voiding the warranty?

Opening the watch yourself voids any remaining warranty. If the watch is still under warranty and the battery is failing, contact Apple for a replacement. If the warranty has expired, opening it yourself will not affect anything, but you lose the option to send it to Apple later if something goes wrong during the replacement.

What is the difference between splash-resistant and water-resistant?

Splash-resistant watches can handle light rain or sweat but should not be submerged. Water-resistant watches can be worn while swimming or showering. After a battery replacement, confirm with the repair shop whether they have restored the original water resistance rating, especially if you plan to swim with the watch.

Is it cheaper to replace the battery or buy a new watch?

Battery replacement costs $50 to $100, while a new Apple Watch starts around $250. Unless the watch is very old or has other damage, replacement is almost always the cheaper option. A battery replacement can extend the watch's life by another two to three years.

What happens if I use the wrong adhesive when reassembling?

Generic double-sided tape or super glue will not seal the watch properly and will not restore water resistance. The watch may also be difficult to open again if you ever need another repair. Always use adhesive strips designed specifically for Apple Watch models.