An electric appliance includes a first electric power supply of first batteries arranged in a first pattern, and alternatively a different second electric power supply of second batteries arranged in a second pattern. An electrical ON-OFF switch has an ON-OFF position push-button switch actuator ard...http://www.google.ca/patents/US6046572?utm_source=gb-gplus-sharePatent US6046572 - Battery operated appliance, flashlight and switching systems
