Power tool system and adapter therefor

A power tool system comprising:

• a hand-held power tool comprising a housing having a battery pack interface, an electrically-driven device and a first connector,
• a battery pack configured to be detachably attached directly to the battery pack interface and to supply current to the electrically-driven device, and
• an adapter comprising a second connector configured to be physically and electrically connected with the first connector in a detachable manner, the adapter being configured to:
• receive power from the battery pack via the hand-held power tool and
• provide at least one additional electrical function to the hand-held power tool or to perform at least one additional electrical function that the hand-held power tool is not otherwise capable of performing,
• wherein the adapter is at least partially disposed in a space defined in part by the housing and in part by the battery pack when the housing and battery pack are attached to each other.