Patent ID: 6914412

Claim:
A process for transferring electrical energy from a first electrical energy storage device to a second, rechargeable electrical storage device, comprising the steps of sensing the voltage in said first electrical energy storage device, sensing the voltage in said second electrical energy storage device, determining the difference in the voltages in said first and said second electrical energy storage device, flowing current from said first electrical energy storage device to said second electrical energy storage device, adjusting the rate of current flow from said first electrical energy storage device to said second energy storage device by means of a controller, providing power to said controller by means of a switch that switches the power supplied to the controller from said first electrical energy storage device to said second electrical energy storage device, and from said second electrical energy storage device to said first electrical energy storage device, and means for insuring that said voltage in said first electrical energy storage device is higher than said voltage in said second electrical energy storage device.