Evgenij Barsoukov, Dan R Poole, David L Freeman: Circuit and method for monitoring battery state of charge. Charles R Hoffman, Cahill Von Hellens & Glazer, July 1, 2004: US20040128086-A1

A processor (13) operates to determine amount of charge presently stored in a battery by determining that the battery is in a zero-current relaxed condition. Circuitry (16,23) including a first ADC (16) measures an open circuit voltage (OCV) of the battery prior to a period of time during which flow ...