If you do not use the Rebel for long periods of time or you don't use it for long each time you do use it, the clock battery may not charge. This may look like it is not working but in fact it is OK. Turn the camera on and leave it on overnight.
The camera got dipped in a beautiful Maui waterfall for a few seconds. After it dried out, everything seems to work fine except that it doesn't keep the time. I left it on last night, but I guess it turned off by itself. I disable the power saving and will leave it on tonight.
I air dried the camera until I got home. I put the camera and lens in a zip bag with rice for about 3 days. The camera and lens worked fine until I take out the battery (even momentarily.) It goes back to the rice bag and I'll test in another week.
Maybe the internal battery (or just capacitors?) was damaged when shorted in water.
This tiny battery is located on the SL1 main board just above the SD card slot. I believe only a Canon service center or a camera repair shop can replace it. My SL1 was bought when they were introduced. Never had an issue. I only know about this battery as I was given a sand and water damaged SL1 to check out and the board was fried. So I have disassembled an SL1 to the last screw.
4 x 7Dmk1, 1 each 5Dmk2, 5Dmk4, 5Ds 5DsR, 6Dmk1, SL1, A1, A2 & lots of lenses. I run ML on 1 7D.
09/26/2023: New firmware updates are available.
08/18/2023: Canon EOS R5 C training series is released.
07/31/2023: New firmware updates are available.
05/31/2023: New firmware updates are available.
05/18/2023: New firmware updates are available.
03/30/2023: New firmware updates are available.