What happens if a iwatch is switched off for a long time
what happens if a apple iwatch is switched of for a long time?
Apple Watch
When the battery gets low, when turned on Apple Watch will automatically enter Power Reserve mode. In this mode, it will only display the red lightning symbol (Charge icon) and the time for 6 seconds at a time in order to conserve battery life for as long as possible.
To turn your watch back on: press and hold the side button until you see the Apple logo and wait for your Apple Watch to restart.
You may need to charge your Apple Watch first.
More info here: Using Power Reserve - Apple Support