Google Inc.

Kenneth L Kessler

Robert Michael Johnson, Jr

Richard Jakubowski

An apparatus () includes at least one electrochemical cell () and at least one pass element () serially coupled with the electrochemical cell. A control circuit () is operable to open the at least one pass element when a charger () or power supply () is connected to the electrochemical cell for at least a predetermined time and to measure an open circuit voltage of the at electrochemical cell to determine a state of charge. The control circuit can then close the pass element to charge the electrochemical cell, determine an amount of the charge, and store an estimated energy capacity of the electrochemical cell based upon the open circuit voltage and the amount.

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Lake Zurich, IL, United States of America

Kenneth L Kessler