Adapting portable electrical devices to receive power wirelessly

Wireless power receiving apparatus (150) is retrofitted to a portable electrical device (100) to enable the device to receive power wirelessly. The apparatus (150) comprises a power-receiving element (200) adapted to be attached to the device (100), e.g. by adhesive (201), and also being adapted to receive power wirelessly from a transmitter of power when the element and transmitter are in proximity with one another. One or more power connectors (203) are connected electrically to the power-receiving element (200) and are adapted to be connected, when the apparatus (150) is in use, to one or more corresponding power connectors (101) of the portable electrical device (100) to deliver power received by the element (200) to the device (100). The power-receiving element (200) may be in the form of a sticker or may be carried by or incorporated in a replacement cover portion for the portable electrical device (100).