Bilge pump cycling every 2 1/2 minutes?

[Old Sarge]

I was cleaning up my boat today and kept hearing a "servo motor" sound cycling every 2 1/2 minutes. It lasts for about a second or so. I checked and the main battery switch was off. All the other switches at the helm are off. I figured it must be an automatic bilge pump. We purchased the boat new last April. We used it all summer last year and never heard the bilge pump come on once. We stored the boat at Irwin's last year. I know they disconnect the batteries during the winter and maybe it just wasn't hooked up last year and this year it got connected? My concern is we don't use the boat every day and this thing will be cycling every couple of minutes, will it run down the battery? Anyone with experience with these pumps? I do have a call into Irwin's, waiting to hear...