Patent ID: 8723482

Claim:
A battery unit balancing system comprising: a. a discharging circuit configured for connection to a battery unit comprising: i. a voltage dividing circuit; ii. a comparator circuit comprising: 1. a shunt regulator configured in parallel with said voltage divider; iii. one or more current source circuits comprising: 1. current regulator; and 2. an output device; wherein said output device, said shunt regulator and said one or more current source circuits are connected in parallel with the battery unit, wherein, while connected to the battery unit, the discharging circuit is configured for automatic activation such that, when a voltage of the battery unit exceeds a predetermined threshold, the discharging circuit draws a constant discharging current from the battery unit until the voltage of the battery unit falls below the predetermined threshold; wherein the voltage dividing circuit is connected to the comparator circuit via a node to the shunt regulator, said shunt regulator is connected to said current source circuit via a current limiting resistor of said output device, whereby the comparator circuit is activated to conduct when the voltage of the battery unit exceeds the predetermined threshold, the voltage dividing circuit is programmed to generate a predetermined voltage, wherein the predetermined voltage activates the one or more current source circuits via the comparator circuit, and whereby each current source circuit of the one or more current source circuits is configured such that a substantially stable current flows independent of the voltage of the battery unit.