Abstract: A charger for a rechargeable battery pack of a power tool includes a housing and a printed circuit board on which electrical components are mounted. The printed circuit board being mounted in the housing. The housing includes vent openings disposed below the printed circuit board and vent openings disposed above the printed circuit board.

Abstract: The present invention relates to an interchangeable battery for a battery-operated electric tool with a contact arrangement which, in order to charge the battery cell or cells by means of a charger having open counter-contacts, has at least a first freely accessible contact area per contact by means of which the battery can be connected to the counter-contact of the charger, the interchangeable battery is constructed according to the invention in such a way that it can also be charged by means of a charger with a screened contact region in that either the contacts of the battery are contact pins or blades which can be inserted into a contact region screened as far as a closely restricted aperture of a charger with screened counter-contacts or the contacts of the battery have a region screened by a wall which has such a wall thickness that the contacts with the entire wall can be inserted into the screened contact region.