translate English to French: Because the keying feature of each pack is unique to that combination of tool and battery pack, this feature ensures that the voltage output of the battery pack matches the requirement of the power tool and also prevents another manufacturer's battery from being used.
Chaque assemblage outil/bloc-piles a un dispositif de chiffrement qui lui est particulier, ce qui garantit que le voltage du bloc-piles correspond aux exigences de l'outil électrique et empêche qu'on utilise le bloc-piles d'un autre fabricant.