A method for determining the amount of charge which can be drawn from a storage battery includes determining a battery voltage and current profile over at least one time interval; smoothing the battery voltage profile and the battery current profile using at least two different smoothing measures; and...http://www.google.co.uk/patents/US6967466?utm_source=gb-gplus-sharePatent US6967466 - Method for determining the amount of charge which can be drawn on a storage battery, and monitoring device for a storage battery
