Provided are a battery state monitoring circuit in which charging of a secondary battery in an over-charge detection state is prevented to improve safety, and a battery device including the battery state monitoring circuit. A circuit for consuming a leakage current is provided in the battery state monitoring circuit to prevent the secondary battery from being charged with the leakage current.

 
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> Systems and methods for providing over-current protection in a switching power supply

> Modulation charging circuitry for battery charging using a power source providing different levels of current

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