Where to find battery health information on your Apple Watch
Apple Watch shows you battery health in the Settings app on the watch itself. Open Settings, tap Battery, then Battery Health & Low Power Mode. You will see your current battery percentage and a section labeled Maximum Capacity — this number tells you how much charge your battery can hold compared to when it was new. A battery at 80% maximum capacity, for example, holds 80% of the original charge it could store.
You can also check battery health from your iPhone using the Apple Watch app. Open the Watch app, go to Battery, and look for Battery Health & Low Power Mode. The information syncs between your watch and phone, so both places show the same data.
Battery health information is available on Apple Watch Series 6 and newer models. Older watches do not display maximum capacity — they show only the current battery percentage.
Key Takeaways
- Maximum capacity on your Apple Watch tells you what percentage of the original battery charge your watch can now hold.
- You can check battery health directly on your watch through Settings > Battery > Battery Health & Low Power Mode, or through the Apple Watch app on your iPhone.
- A battery at 80% maximum capacity or higher is performing normally; below 80% means the battery is aging and may need service.
- Only Apple Watch Series 6 and newer show maximum capacity; older models display only current battery percentage.
What maximum capacity percentage means
Maximum capacity is a percentage that shows how much of the original battery charge your watch can store. When your watch is new, maximum capacity is 100%. Over time and with regular charging cycles, this number drops. A watch showing 85% maximum capacity can hold 85% of the charge it held on day one.
This decline is normal. Lithium batteries, which power Apple Watches, lose capacity gradually with use. You might notice your watch drains faster than it used to, or you need to charge it more often — that is usually because maximum capacity has dropped.
When battery health means you should get service
Apple considers a battery degraded when maximum capacity falls below 80%. At this point, the battery is aging faster than normal and may not hold a full day of charge. If your watch shows below 80% maximum capacity and you are having trouble getting through a full day, contact Apple Support or visit an Apple Store to discuss a battery replacement.
Battery replacement is not free, and the cost varies depending on your watch model and whether you have AppleCare+. If you have AppleCare+, battery service is usually covered if the battery capacity has dropped below 80%. Without AppleCare+, you pay out of pocket — amounts vary by model but typically range from $70 to $100.
You do not have to replace the battery the moment it drops below 80%. If your watch still lasts a full day and you are satisfied with the performance, you can wait. The decision depends on your own use and whether you want to keep the watch or are considering replacing it.
How to extend battery health and slow capacity loss
Avoid letting your watch battery drain completely to zero regularly. Charging it before it fully dies is gentler on the battery. Similarly, avoid leaving your watch plugged in and charging for days at a time — unplug it once it reaches 100%.
Keep your watch at moderate temperatures when possible. Extreme heat or cold can stress the battery and speed up capacity loss. If you use your watch during intense exercise or in hot weather, let it cool down before charging.
Disable features you do not use regularly, such as always-on display or constant heart rate monitoring, if battery drain is a concern. These features do not damage the battery, but they do cycle it more often, which gradually lowers maximum capacity over time.
The difference between battery percentage and maximum capacity
These two numbers measure different things and can confuse people. Battery percentage is how much charge is in your watch right now — the number you see at the top of the watch face or in Control Center. Maximum capacity is how much total charge your battery can hold, measured as a percentage of what it held when new.
Think of it this way: if your watch shows 50% battery, that means half the current maximum capacity is in the battery. If maximum capacity is 80%, then that 50% represents 50% of 80%, or 40% of the original battery size. Both numbers matter — you need current percentage to know if you need to charge now, and maximum capacity to know if the battery itself is aging.
Troubleshooting battery health that seems wrong
If your maximum capacity number seems too low for a relatively new watch, or if it dropped suddenly, restart your watch first. Hold the side button until the power-off slider appears, then drag it to turn off the watch. Wait a few seconds, then hold the side button again to turn it back on. Sometimes the battery health reading updates after a restart.
If the number does not change and seems inaccurate, unpair your watch from your iPhone and set it up again. This forces a fresh sync of battery information. Open the Watch app on your iPhone, go to All Watches, tap the info icon next to your watch, and select Unpair Apple Watch. Then set it up again as a new watch. Your data will restore from backup, but the battery health reading will refresh.
If maximum capacity is still showing as very low on a new watch, contact Apple Support. A genuinely defective battery would be covered under the one-year limited warranty.
Frequently Asked Questions
Is 85% maximum capacity bad?
No. Apple considers 80% and above normal. At 85%, your battery is performing as expected for a watch that has been used for a while. You should not notice significant changes in how long your watch lasts on a charge.
Can I check battery health on an older Apple Watch?
Older models before Series 6 do not display maximum capacity. You can see only the current battery percentage. If you want to know the actual health of the battery, you would need to contact Apple or visit an Apple Store for a diagnostic.
Does Low Power Mode affect battery health?
No. Low Power Mode reduces power use to extend the current charge, but it does not change how fast maximum capacity declines. It is a temporary setting that helps you get through the day on less charge, not a long-term battery protection feature.
Why did my maximum capacity drop suddenly?
Sudden drops are rare and usually mean the battery reading was not accurate before. Restart your watch and check again. If it drops significantly after a software update, that is also usually a recalibration of the reading, not actual battery damage. If the drop is real and your watch is under warranty, contact Apple.
What happens if I ignore a low battery health warning?
Your watch will continue to work, but it may not hold a full day of charge. You might need to charge it more often or use Low Power Mode regularly. There is no safety risk — the watch straightforward becomes less convenient to use as the battery ages.