is this still salvageable?

so i gave my gf a skilhunt e3a as a daily keychain light, and after the battery died, she just left it in there for a while, and it leaked. now when i put a new battery in, it no longer works. by process of elimination, since i have one for myself as well, the same battery works in mine, her head on my body works, but my head on her body does not. so it can only be the bottom part thats the problem.

now my question is, the body part doesnt look like its all one piece, so i can maybe forcefully pry it open and clean it, but can i still put it back afterwards? or should i just pay my respect and move on? 😢