Was outside putting all the Christmas light bins away... And my SB's air pump started hammering away... NNNNNNNNNNNNNNNNNNNNNNNNNNN... AND THEN turned off.

No keys in inginition. Hasn't been driven in 4 months. Is this NORMAL?

If not, Could explain why battery doesn't last long in my SB when I don't drive it for 5 months at a time?

How do I fix?