A device to-be-charged, comprising: a battery; a wireless receiving circuit, configured to receive an electromagnetic signal from a wireless charging device and convert the electromagnetic signal into an output voltage and an output current to be provided to the battery; a detecting circuit, configured to detect at least one of the output voltage and the output current of the wireless receiving circuit; a communication control circuit, configured to conduct wireless communication with the wireless charging device, to provide at least one of the output voltage and the output current detected by the detecting circuit to the wireless charging device, to adjust a transmission power of the wireless transmitting circuit to meet charging requirements of the battery, wherein the output current of the wireless receiving circuit is a pulsating direct current such that heating of the battery is reduced, wherein the device-to-be-charged further comprises a first charging channel configured to receive the output voltage and the output current of the wireless receiving circuit, wherein the battery is charged directly according to the output voltage and the output current of the wireless receiving circuit through the first charging channel, wherein the device-to-be-charged further comprises a second charging channel, provided with a converting circuit, wherein the converting circuit is configured to receive and convert the output current of the wireless receiving circuit, wherein the battery is charged according to the output current subjected to the conversion, and wherein the first charging channel comprises a switch configured to switch between the first charging channel and the second charging channel. a battery; a wireless receiving circuit, configured to receive an electromagnetic signal from a wireless charging device and convert the electromagnetic signal into an output voltage and an output current to be provided to the battery; a detecting circuit, configured to detect at least one of the output voltage and the output current of the wireless receiving circuit; a communication control circuit, configured to conduct wireless communication with the wireless charging device, to provide at least one of the output voltage and the output current detected by the detecting circuit to the wireless charging device, to adjust a transmission power of the wireless transmitting circuit to meet charging requirements of the battery, wherein the output current of the wireless receiving circuit is a pulsating direct current such that heating of the battery is reduced, wherein the device-to-be-charged further comprises a first charging channel configured to receive the output voltage and the output current of the wireless receiving circuit, wherein the battery is charged directly according to the output voltage and the output current of the wireless receiving circuit through the first charging channel, wherein the device-to-be-charged further comprises a second charging channel, provided with a converting circuit, wherein the converting circuit is configured to receive and convert the output current of the wireless receiving circuit, wherein the battery is charged according to the output current subjected to the conversion, and wherein the first charging channel comprises a switch configured to switch between the first charging channel and the second charging channel.