Abstract: A power supplying system includes multiple rechargeable battery devices each including a first switch module, a series connection of a battery unit which includes multiple rechargeable batteries connected in series with each other and a second switch module connected in parallel to the first switch module, and a control module for controlling operations of the first and second switch modules. For each rechargeable battery device, the first and second switch modules are normally operated in an OFF-state and an ON-state, respectively, and the control module enables the first and second switch modules to switch respectively from the OFF-state and the ON-state to an ON-state and an OFF-state upon detecting that a voltage of any one of the rechargeable batteries of the battery unit is not within a predetermined voltage range during charging or discharging of the battery unit.

Abstract: A charge system for series connected rechargeable batteries includes: a power generating unit generating a DC input power based on a voltage input from an AC power source; a charge control unit generating a charge voltage based at least the DC input power from the power generating unit and supplying the charge voltage to the rechargeable batteries through an interface unit; and multiple detecting units each detecting a voltage of a corresponding rechargeable battery through the interface unit, generating a feedback power based on the voltage of the corresponding rechargeable battery upon detecting that the voltage of the corresponding rechargeable battery is within a predetermined voltage range, and outputting the feedback power to the charge control unit such that the charge voltage is generated by the charge control unit further based on the feedback power from any one of the detecting units.