Good morning, Osney. Yes, the entire battery pack was replaced a year ago. I do not know about the heritage of the batteries themselves. I suspect there was a software update as well as reverse tone and some instrument panel indicators worked differently. We, too, stored our buggy in a barn stuffed with other equipment. It is on a farm property upon which we do not reside. Our first thought was “thank goodness this didn’t happen in the middle of the night. We would have lost everything”!