A radiation imaging apparatus that generates an image by receiving radiation transmitted through an object, comprises a sensor array configured to detect radiation, an obtaining unit configured to obtain an image signal from a detection signal of the sensor array, a power reception unit configured to receive power supplied from outside, and battery that is charged by using the power received by the power reception unit. The radiation imaging apparatus generates, in response to the satisfaction of a predetermined condition after power reception is started by the power reception unit, an image for correction by obtaining the image signal from the obtaining unit.