on most (all?)808 manual batteries the hole doesn't actually go into the battery. but even on my autos i've gotten liquid in them many times... one finally started acting up after about 5 months (I wasn't even expecting them to last that long even with perfect care, which i definitely don't give them). I figured there was nothing to lose with that one, so ran it under very hot water, from the threaded end, soaked the whole thing in alcohol, then ran under water again directly into the hole (as far as i can tell, none of this is recommended, but it was either that or toss it in the trash) that battery still works today. (although I think I fried something on the board because if you charge it all the way up it acts weird, I think if i'd let it dry completely before using it maybe even that wouldn't have happened, but the diaphragm switch works perfectly)
Anyway, it's to the point now where I don't even worry about liquid in there anymore. I try not to get any in there, but I also don't freak out and go out of my way to try to "save my battery" either.