Long ago, batteries used glass cell containers held in wood with tarred wood for cell tops and the total battery top. Cold wood with acid and tar surely conducted well when exposed to condensation.
Then batteries went to hard rubber cases, with the cell tops closed by hard rubber and tar. Condensation and leakage through the hard rubber was part of the storage on concrete problem (to say nothing for the effect of a bit of acid on the concrete.
Modern batteries use plastic cases with one piece tops, and sometimes the seal between the top and the side is below acid level and sometimes acid gets out at that seam.
A whole generation of batteries didn't have a seal around the battery posts which made for short life of the mating connectors and the battery was wrecked when picked up by the posts.
The latest batteries generally (but the construction can fail) are well sealed and so keep the acid inside and only an accumulation of dirt on the top could contribute to leakage currents when the battery is cooler than the surrounding air leading to condensation.
Counter to the electrical leakage from condensation when the battery is cool, the cooler battery should last longer in storage because chemical rates are slower when cool.
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Today's Featured Article - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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