Battery charger for several nominal voltages

摘要

A battery charger is capable of charging two lithium batteries, suitable for a cordless power tool, having different nominal voltages. The batteries have identification components representing a value of the nominal voltage or a range for the nominal voltage, and the charger reads the identification component and adapts its operation. A microcontroller may be present in the battery or in the charger, and the charger may also read battery condition data during charging. Also claimed are an electrical device capable of identifying battery chemistry or nominal voltage; a battery having an interrupt condition switch; a battery charger capable of charging two batteries with different chemistries; and a battery charger that selects a threshold according to a nominal voltage of a battery pack.