Yes, but Apple and most owners do not recommend it
You can physically replace an Apple Watch battery, but the process requires tools most people do not own, voids your warranty, and risks damaging the watch. Apple does not sell batteries to consumers — they only replace them through their repair service. Third-party repair shops and some electronics retailers offer battery replacement, but quality and pricing vary widely.
The real question is not whether it is possible, but whether it makes financial sense. A battery replacement through Apple costs between $79 and $99 depending on your watch model, takes about a week, and comes with a warranty on the repair. Doing it yourself costs $20 to $40 for the battery and tools, but if something goes wrong, you own the broken watch.
Key Takeaways
- Apple Watch batteries are glued in place and require heat, prying tools, and steady hands to remove without cracking the screen or damaging internal parts.
- Apple's official battery replacement costs $79 to $99 and takes five to seven business days, but includes a warranty on the work.
- Third-party repair shops charge $40 to $80 and often complete the work the same day, though quality depends on the shop's experience with watches.
- Replacing the battery yourself voids any remaining warranty and risks permanent damage if the screen cracks or components are bent during removal.
- Most Apple Watch models hold a charge for three to five years before the battery degrades enough to need replacement.
What happens inside an Apple Watch battery
Apple Watch batteries are lithium-ion cells, the same chemistry used in iPhones and most portable devices. Over time, they lose the ability to hold a full charge — a process that starts the moment you first charge the watch and accelerates after about 500 charge cycles, roughly two to three years of daily use.
You will notice the battery degrading gradually. The watch might drop from 20 percent to 5 percent in an hour instead of lasting all day, or it might shut down at 30 percent even though the display says it has more charge left. These are signs the battery's internal chemistry has worn out, not that the watch is broken.
The battery itself is small — roughly the size of a large coin — and sits directly under the back case. It is glued to the case with adhesive that requires heat to soften. Once removed, the old battery cannot be reused.
How Apple replaces the battery
When you take an Apple Watch to an Apple Store or send it to Apple's mail-in repair service, a technician heats the back case, carefully pries it open, disconnects the battery connector, removes the old battery, and installs a new one. The entire process takes about 30 minutes of hands-on work, but the watch stays in the repair queue for five to seven business days.
Apple's repair includes a one-year warranty on the battery and the work performed. If the battery fails within that year, Apple replaces it again at no charge. You also get back a watch that has been tested and verified to work correctly.
The cost is $79 for most standard models (Series 3 through Series 9) and $99 for Ultra models. If your watch is still under the original one-year manufacturer's warranty, battery replacement is covered at no cost. AppleCare+ extends this coverage to two years from purchase.
Third-party repair shops and what to expect
Independent watch repair shops, phone repair chains, and some Best Buy locations offer Apple Watch battery replacement. Pricing typically ranges from $40 to $80, and many shops complete the work within a few hours or the same day.
The trade-off is consistency. A shop with experience replacing watch batteries will do the job well. A shop that mostly repairs phones and rarely touches watches may rush the work or use lower-quality batteries. Before choosing a shop, check reviews specifically mentioning Apple Watch repairs, ask what brand of battery they use, and confirm they offer a warranty on the replacement.
Third-party repairs do void Apple's warranty on the watch itself, though the shop should warranty their own work for at least 30 days. If something goes wrong after that period, Apple will not repair it for free.
Doing the replacement yourself: tools and risks
If you decide to replace the battery yourself, you will need a heat gun or hair dryer, a plastic pry tool or spoon, tweezers, a small Phillips screwdriver, and a replacement battery compatible with your watch model. These items cost $20 to $40 total if you do not already own them.
The actual steps are: heat the back case for 30 to 60 seconds to soften the adhesive, carefully pry the case open using a plastic tool (not metal, which can scratch or short-circuit components), disconnect the battery connector, remove the old battery, insert the new one, reconnect the connector, and press the case back on. The entire process takes 15 to 30 minutes if you work slowly and carefully.
The risks are real. If you explore too much heat, you can damage the screen or internal components. If you pry too hard, you can crack the case or bend the connector. If you touch the wrong part of the circuit board with a metal tool, you can short it out. If the case does not seal properly after reassembly, water can get inside and destroy the watch. Any of these outcomes leaves you with a watch that costs $200 to $400 to replace.
When battery replacement makes sense
Battery replacement is worth considering if your watch is between two and five years old, still works otherwise, and you plan to keep using it. If the watch is older than five years, the battery is not the only thing wearing out — the screen, speaker, and other components are also degrading, and replacement costs add up.
If your watch is still under warranty or you have AppleCare+, use Apple's service. The cost is covered or minimal, and you get a warranty on the work. If you are out of warranty and the watch is a model you like and use daily, a $79 repair extends its life by another two to three years, which is often cheaper than buying a new watch.
If the watch is a hand-me-down, a backup you rarely use, or a model you were planning to replace anyway, the math changes. A third-party repair at $50 to $70 might be worth it. Doing it yourself is only worth the risk if you are comfortable with the possibility of destroying the watch and you have done similar repairs before.
What to do if the battery is not the problem
Before you replace the battery, confirm that poor battery life is actually caused by the battery and not by something else. Check Settings > Battery to see which apps are using the most power. If one app is draining the battery, force-close it or uninstall it. Restart the watch by holding the side button until the power-off slider appears, then slide to power off and back on.
If the watch is running an old version of watchOS, update it by opening the Watch app on your iPhone, going to General > Software Update, and installing the latest version. Older software sometimes has battery drain bugs that newer versions fix.
If the watch is less than two years old and the battery life has dropped suddenly rather than gradually, the battery may be defective. Contact Apple or visit an Apple Store — defective batteries are sometimes replaced under warranty even if the watch is out of the standard coverage period.
Frequently Asked Questions
How long does an Apple Watch battery last before it needs replacing?
Most Apple Watch batteries hold a usable charge for three to five years with daily use. You will notice the battery draining faster around the three-year mark. The exact timeline depends on how often you charge it and which model you own — newer models sometimes have slightly larger batteries.
Is it cheaper to replace the battery or buy a new watch?
If your watch is two to four years old and otherwise works well, battery replacement at $79 to $99 is almost always cheaper than a new watch, which costs $250 to $800. If the watch is five years or older, other components are also wearing out, and the total repair cost may approach the price of a new model.
Will Apple replace the battery if I bought the watch used?
Yes. Apple replaces batteries for any Apple Watch, regardless of where it was purchased or who owns it. You will pay the standard service fee ($79 to $99) unless the watch is still under AppleCare+ coverage, which transfers to the new owner if the previous owner registered it.
What happens if I replace the battery and the watch still does not hold a charge?
If a new battery does not solve the problem, the issue is likely the charging port, the power management circuit, or the screen. These repairs cost more than battery replacement and may not be worth the cost depending on the watch model. A technician can diagnose the real problem before you pay for repairs.
Can I use a cheaper third-party battery instead of an Apple battery?
Yes, but quality varies. Some third-party batteries work well for two to three years. Others fail within months. Shops that use name-brand batteries (like Sunwoda or Celgrid) tend to have better results than shops that buy the cheapest option. Ask the shop which brand they use and whether they warranty the battery separately from the labor.