Apple Watch series 3
When I try to restart it I get time in green numbers and a red lightning symbol
Apple Watch Series 3, watchOS 8
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That's power reserve mode;
To turn off power reserve mode,press and hold the side button for about 10 seconds, until you see the watch restart and the Apple logo appear. Keep in mind that if your battery is almost completely empty, you might need to charge the watch before it will restart normally.