I always try to take batteries out of things I know I won't be using (my 8 yo grandson thinks I'm weird when I take the batteries out of the Wii controller!)
From time to time I come across things I didn't know we wouldn't be using that have corroded batteries in them. Then I hand them over to my DH and he takes care of them! But it is good to have this tip in case he's not around. I've saved it to my computer.