Boat Storage and Batteries

[McGunner]

Hello, newbie here to the site and I have a question.

I bought a 2006 Bass Tracker PT175 with a Mercury 50 HP outboard at Bass Pro back in July of 2005 and only got it out on the water for 3 1/2 hours last summer before I winterized it and put it away for the winter. I ended up getting mobilized and sent to Iraq so i couldn't exactly use it this past spring/summer.

I just returned home a few weeks ago and today I went out to the carport in my back yard to check it out. I untarped it and (after calming down after cleaning up after the neighbor's cat that crawled under the tarp for shelter) I realized that the batteries were still hooked up and had been since I'd winterized it late last summer.

I retrieved the key and turned it to accessory and the gauges all fired right up without missing a beat. The boat has been sitting tarped on a concrete slab under a carport for about 15-16 months now.

My question is this; Are the batteries okay would you say? I was thinking that come this spring I would plug in the built in trickle charger a day or so before I take it out and I would imagine it would be good to go. Am i correct in this assumption?

Any advice would be greatly appreciated. Thanks.