Patent ID: 8222865

Claim:
A hybrid battery pack, comprising: a first power source having a first switching circuit; a second power source connected to the first power source in parallel and having a second switching circuit; a current sensor configured to sense the current of the first and second power sources; and a controller configured to obtain the voltages of the first and second power sources and to control the first and second switching circuits so that the first and second power sources are not over-charged or over-discharged and to calculate the capacity of the first and second power sources, wherein the current sensor is connected to both the first and second power sources and is directly connected to both the first and second switching circuits, wherein the controller is configured to control the first and second switching circuits based on the current sensed by the current sensor, and wherein the first and second switching circuits are configured to affect charging and discharging of the first and second power sources based on the current sensed by the current sensor.