Telefonaktiebolaget Lm Ericsson (publ)

Derek Liddle

Jeremy Robert Carlson

Kristoffer Ptasinski

Charles Forsberg

Sarandis Kalogeropoulos

Rickard Andersson

Petrus Evers

David Demers

Method and apparatus for calibrating a rechargeable battery for mobile telephones and other electronic devices. Calibration is accomplished during a process of completely charging the battery by determining the total amount of charge accepted by the battery during the charging process, and providing a value of total charge capacity of the battery based, at least in part, on the total amount of charge accepted by the battery. The total charge capacity of the battery is used to calculate remaining battery capacity and to predict the remaining operational time of the device. Alternative calibration procedures are provided if the battery is not completely discharged before charging or if the battery is not fully charged by the charging process. The calibration procedures of the invention require no interaction from a user (other than his initiating the normal charging process), and typically permits a calibration to be carried out notwithstanding varying usage habits of different users.

Method and apparatus for calibrating a rechargeable battery

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Hampshire, United Kingdom

Derek Liddle