Patent ID: 7825624

Claim:
A battery-operated power output device adapted for charging a rechargeable battery load using a dry cell power source, said battery-operated power output device comprising: a battery seat adapted for receiving the dry cell power source therein and for connecting electrically to the dry cell power source; a charging signal generator connected electrically to said battery seat and operable to generate a charging signal output that can be varied to meet voltage requirement of the rechargeable battery load; a power source connector adapted for connecting electrically to the rechargeable battery load; a safety switch connected electrically to said power source connector and said charging signal generator and operable to make or break electrical connection between said power source connector and said charging signal generator; a detecting module connected electrically to said charging signal generator for detecting voltage and current values of the charging signal output; a timer unit operable to initiate a timer operation upon supply of the charging signal output from said charging signal generator to said power source connector via said safety switch; and a switch controller connected electrically to said safety switch, said detecting module and said timer unit, receiving a timer signal from said timer unit and detected voltage and current values from said detecting module, operable to control said safety switch to break electrical connection between said power source connector and said charging signal generator at the end of a charging period, and further operable to control said safety switch to break the electrical connection between said power source connector and said charging signal generator according to the detected voltage and current values from said detecting module upon occurrence of one of abnormal voltage and current conditions.