A circuit (103) for charging a battery (101) is connected to an input (126) for inputting a signal indicative of a temperature of the battery. A switch (108) selectively supplies power to the battery under the control of a control signal. A microcontroller (140) calculates a rate of change ...http://www.google.com/patents/US5747970?utm_source=gb-gplus-sharePatent US5747970 - Battery charger charging time control
