Apple has recommended all Apple Watch users to only use chargers made by Apple, or chargers that have completed Apple MFi certification and use the Made for Apple Watch badge.
The company warns that if you use a counterfeit or uncertified charger, you could experience slow charging, repeated chimes, and reduced battery lifespan.
If your watch charger is made by Apple, one of the following model numbers appears on the cable:
A1570 A1598 A1647 A1714 A1768 A1923 A2055 A2056 A2086 A2255 A2256 A2257 A2458 A2515 A2652 A2879You can also check the manufacturer of the charger using your Mac:
Connect your Apple Watch charging cable to your Mac. On your Mac, choose Apple menu > System Settings, then click General in the sidebar. Click About on the right. Click System Report. Click USB. Choose your watch charger to view details. Locate the manufacturer. Watch chargers made by Apple list Apple Inc. as the manufacturerTo identify third-party chargers that have completed MFi certification, look carefully at the charger’s packaging and at the charger itself. Authorized Apple Watch chargers use the Made for Apple Watch badge on their packaging.
To check whether your charger is certified, you can search the public database of authorized MFi accessories.
