What does the red charge icon mean on the iwatch
What does the red charge icon mean on the iwatch
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Hi
You may be referring to Power Reserve mode.
Apple Watch displays the time and a red lightning bolt (and cannot be used for any other functions) when it has entered into Power Reserve mode automatically, which happens when the battery reaches a low charge level (the mode can also be enabled manually).
To restart your Apple Watch: press and hold the side button until you see the Apple logo.
You may need to charge it before it can be restarted.
More information:
Check your battery and charge your Apple Watch - Apple Support