Battery charging system and method

The invention provides a method of identifying a battery (102) provided with a wireless battery control device (108), during a battery charging procedure. The method includes connecting the battery to a battery charger (100) and the battery charger supplying a first current to the battery. The wireless battery control device measures parameters relating to the first current. The battery charger generates and sends a first wireless interrogation signal (from 106), the wireless interrogation signal including information relating to parameters of the first current. The first wireless interrogation signal is configured such that a wireless battery control device receiving the interrogation signal compares the information relating to the parameters of the current being received by the associated battery to the information relating to the parameters of the first current that was supplied by the battery charger, and the wireless battery control device sends back a first wireless response signal should the information relating to the parameters match.