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 . <EOS>