Method and apparatus for foreign object detection parameter and charging data communication with wireless charging capable battery pack

Method and apparatus example embodiments provide device-to-device charging. According to an example embodiment of the invention, a method comprises accessing, by an apparatus, parameters relating to power loss in wirelessly charging a rechargeable battery (160), when the battery (160) is located in a device (200) to be powered by the rechargeable battery (160); and transmitting, by the apparatus, to a wireless charger (100), the accessed parameters relating to power loss when the apparatus is associated with the device to be powered by the rechargeable battery.