Patent ID: 7835534

Claim:
An apparatus comprising: a housing having a number of walls, a top and a bottom; a charger located in said housing for charging a removable battery pack of the type which is used to power rechargeable hand tools and other tools; a charging receptacle operatively connected to said charger and being capable of receiving at least one removable battery pack having a positive and a negative connection to be charged by said charger; an audio unit for producing an audio signal located in said housing; a microwave oven heating unit having a first compartment in which food can be placed and heated; an active cooling unit; a user accessible insulated second compartment in which said cooling unit is operatively connected to cool the same; a cord and plug for connecting said apparatus to an AC power source, and circuitry for connecting said AC source to said charger and said audio unit, said circuitry including a converter to provide DC power to power said cooling unit, said circuitry selectively applying power to the audio unit from one of said AC source and a removable battery pack, said circuitry further comprising: a relay connected between a battery pack located in said charging receptacle and said audio unit; a relay coil connected between said cord and said audio unit, said coil monitoring the presence of AC power being applied to said audio unit and causing said relay to open circuit both said positive and negative connections to said battery to thereby electrically isolate said audio unit from said battery when AC power is applied to said audio unit and close circuit when AC power is not applied to said audio unit, thereby enabling said battery pack to power said audio unit when AC power is not applied thereto.