How To Take Iwatch Off Low Power Mode. When Low Power Mode is on your iPhone will last longer before you need to charge it but some features might take longer to update or complete. Once you enter Power Reserve the only way to exit from this power-saving mode is to restart your Watch by holding down the side button until the Apple logo appears.
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The watch then boots into normal mode. Swipe up to see the Apple Watchs battery status. You may need to charge it before it can be restarted.
Check your battery and charge your Apple Watch - Apple Support.
This works when theres enough battery life for booting. You can do that by swiping down with one finger until you hear VoiceOver say control centre and double tap. The watch then boots into normal mode. To turn off Power Reserve mode restart your Apple Watch.
