Apple has introduced a new charging alert in watchOS 26 that helps users identify when their Apple Watch is not charging at its optimal speed. Instead of leaving users guessing whether an accessory is underperforming, the system now provides a clear notification in Settings when it detects a charger that could be improved.
According to Apple’s support document, if your Apple Watch detects that the charging experience could be faster, a “Slow Charger” message will appear under Settings > Battery. This does not mean the accessory is unsafe or unsupported, but it highlights that charging might be less efficient compared to Apple’s official chargers or MFi-certified alternatives.
Apple explains that the feature is designed to improve transparency and user awareness. Many Apple Watch owners rely on different charging setups at home, work, and while traveling. If a charger is underpowered, aging, or not fully optimized, watchOS 26 will now make that clear.
The notification is especially useful for users of Apple Watch models that support fast charging, such as Apple Watch Series 7 and later, as well as Apple Watch Ultra. With these devices, slower chargers can significantly extend the time it takes to reach a full battery. By surfacing this message, watchOS 26 allows users to make informed decisions about whether to continue using a slower charger or switch to a faster, certified accessory.
How to check if your Apple Watch shows a ‘Slow Charger’ message
If you suspect your Apple Watch is charging more slowly than usual, you can easily confirm it:
- On your Apple Watch, open the Settings app.
- Scroll down and tap Battery.
- If your charger is not delivering optimal performance, you will see a Slow Charger message displayed on this screen.
Even if this message appears, Apple confirms that charging remains safe. The alert is informational only, giving you the option to switch to a faster Apple or MFi-certified charger if you want quicker charging.
Apple Watch models that support fast charging
The new “Slow Charger” message is most relevant for Apple Watch models that include fast charging. These devices benefit most from using certified accessories:
- Apple Watch Series 7
- Apple Watch Series 8
- Apple Watch Series 9
- Apple Watch Series 10
- Apple Watch Ultra
- Apple Watch Ultra 2
- Apple Watch Ultra 3
For the best experience, Apple recommends using the included Apple Magnetic Fast Charger or any charger that is part of the Made for Apple Watch (MFi) program. These are optimized to deliver the intended performance, especially when paired with fast-charging models.
With this small but practical addition, watchOS 26 enhances how Apple Watch owners manage power and charging, while also reinforcing the company’s push toward accessory quality and reliability.
