Dan,
It is a good idea when parking any vehicle for an extended time to
remove the battery, and charge it periodically, during the lay-up.

However, there is a product, which I use on my Honda Goldwing, during
the winter months, that monitors the battery's condition, and charges it
automatically, as the voltage drops.

It is called a Battery Tender.

The only fear I would have in your position is if the battery went dead,
it possibly could have froze.

When you go to get it, take another battery with you.

Later,

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Terry 85 GL