Patent ID: 8741462

Claim:
A smoke detector battery container, comprising: a first battery holder for receiving a 9-volt smoke detector battery; a first pair of contacts for establishing electrical connection to a 9-volt battery inserted into said first battery holder; first wiring connected to said first pair of contacts; six pairs of second battery receptacles, each pair of said second battery holders and third battery holders, each of said second battery holders comprising a pair of second contacts and sized to receive AAA batteries, each of said third battery holders comprising a pair of third contacts and sized to receive AA batteries; second wiring connected to said second contacts of said second battery holders and to said third contacts of said third battery holders, said second wiring connecting each one of said pair of third contacts in parallel with a corresponding pair of second contacts such that each pair of third contacts in parallel with each corresponding pair of second contacts, and such that when six batteries are inserted into said six pairs of second battery holders and third battery holders, said six batteries are connected in series; and said first battery holder and said pairs of second battery holders and third battery holders arranged such that when a 9 volt battery is received in said first battery holder, at least one, and not more than three, of said pairs of second battery holders and third battery holders cannot receive its corresponding battery.