Patent Number: 7,786,698

Title: Charging a secondary battery

Abstract: A method of charging a battery includes applying a charging current from a semiconductor device to the battery during a first battery charging time period. The method also includes measuring a charging voltage level at the battery during the first battery charging time period. During a non-charging voltage measurement time interval, the method includes temporarily stopping application of the charging current from the semiconductor device to the battery and measuring a non-charging voltage level at the battery while the charging current is not being applied to the battery.

Inventors: Felder; Matthew (Austin, TX), Schultz; Russell A. (Austin, TX)

Assignee: Sigmatel, Inc.

International Classification: H02J 7/00 (20060101); H02J 7/06 (20060101)

Expiration Date: 8/31/12018