I just took the batteries out of the мышь and they were wet. Is this a bad thing?

Aww....your batteries were crying.....:'(

Yeah, it's pretty bad.
Your batteries might have exploded, или may be leaking.
Depending on how bad it is, Ты may have to see if your мышь still works.
I don't think it's the brand (unless it's happened еще than once), they may have just been bad batteries или something, I'm not sure.

Is this a dirty question...?

Yes it is bad throw the batteries and then wash your hands for 2 mins! And buy a different brand

i dont have a definate answer for you, it could be something as simple as someone spilled some water and it got into the mouse, или they could be leaking acid, either way, rinse your hands off, just to be safe, and dont use those batteries again! are they burning или discoloring your skin?

i wouldent know, im guseeing is bad thign