Method of charging a battery

A method of supplying power to an electronic device (3; 31; 43; 53) having a power consumption in which predictable current peaks occur is disclosed. The device is connectable to a battery (2). The method comprises the steps of supplying power from a power supply (4; 33; 41; 52) to the device, providing a signal (22) from the device indicating that a current peak is about to occur, and connecting the battery to the device under control of said signal so that power is supplied from the battery to the device during the current peak. In this way it is possible to connect the battery just before the arrival of the peak, and thus an unnecessary voltage drop is avoided. Thus the device can be supplied from a standard low price charger after the battery has been fully charged, while predictable current peaks can still be handled without considerable voltage drops.