A battery charger is provided with a connecting part for connection of a rechargeable battery in a freely removable fashion. The charger body has charger terminals protruding from the connecting part to electrically connect with battery terminals of the rechargeable battery. The connecting part of the...http://www.google.ca/patents/US5939859?utm_source=gb-gplus-sharePatent US5939859 - Battery charger with body slot and catch arrangement to prevent incorrect battery orientation
