Ok guys, probably a stupid question but this is my first robotic cleaner, thus want to know if the power supplies are typically water proof. I ask as I put my cleaner in this morning and went to cut the grass. Well the clouds rolled in quickly and thundershower started. Was just at the end of cutting the grass so wanted to finish the lawn before it really started to downpour. Well I lost and downpour started. Forgot about the cleaner so I ran to the back to unplug the unit and put it in the shed. So I ask is this actually something I need to worry about? Didn't read anything in the manual to state whether or not the power supply is waterproof or not. What do you guys think?