NGM Facile SUBITO Guide Rapide page 23

Inserting the Battery: your device is provided with a lithium-ion
battery and is designed to be used exclusively with original NGM
batteries and chargers. The battery must be inserted into the
backside of the phone. Insert the battery into the battery
compartment with the contacts facing down, matching with those
of the phone. When done, put the hind cover back into position as
shown in the following illustrations.
Slot to removing cover
Inserting the battery Placement of the cover
ENGLISH 23