I like Nidabew's suggestion, actually makes it waterproof, but I use Self Cling Ace Bandage material stuff. I wrap the batteries in that, stuff it into the handle, and when I need them, I unwrap them and they are good to go.
"You do not get to pick what kind of bad things will happen to you." Taken from Rory Miller.
Note* sorry for any typos, I make most of my posts from my phone.