I dont know how legit of a claim it is, but this is what ive heard:
"Don't mix wet and dry cell batteries, they can slightly vary with voltage and amperage, and can damage either one over a period of time."
I cant say that they do or dont damage each other, but I'm going all dry cell just in case. The wet/dry logic does seem like it could make sense tho...anyone care to expand on my failing knowledge?