Lenovo YOGA BOOK YB1-X91F Guide De Démarrage Rapide page 6

Starting to use your tablet
You might need to charge the battery before using your tablet.
Charge the battery as shown.
The best way to charge your device is to connect your tablet to a power outlet using the
included cable and USB power adapter.
Low battery
Turning on/off
All manuals and user guides at all-guides.com
Fully charged
Turn on: Press and hold the On/Off button until the Lenovo
logo appears.
Turn off: Tap > Power off.
4
Charging