The PowerShot A530 and A540 cameras affected by the recall have serial numbers that start with "21", "22", "23" and "24". The serial number can be found at the bottom of the camera. Canon will repair all models affected by the recall free of charge no matter if the camera is in warranty or not.
As it should be, the unit will be replaced for free. On the safety notice on Canon's site, they blame the spring that keeps pressure on the battery door. If it sticks out beyond where it should be, it can cause the short.