They are fully charged right now...may hit the bay a couple times yet and they'll be fully topped then. Plugged in once thru the winter to bring back to peak and again before hitting the water. Has worked for decades..will work now, no different than storing old cars like I've done for 30 years in unheated storage, and all the customers airplanes in the hangar. Topped before winter and once thru the winter. I now use the Minnkota single bank charger I took out of my Glastron for doing the airplanes...so I don't have to worry about forgetting I put it on one night to find a fuselage full of acid the next morning. Not leaving anything plugged in 24/7 to find out it has shorted out/squirrels have chewed it... catching the boat on fire...having the charger screw up and stay on high and boil the batteries dry...or any other scenerio. Have seen most of them... I don't think anyone has seen me report... "took my boat to the ramp and it wouldn't start due to a bad battery".