Straight off the charger one unit was reading 24.4v, the other hasn't been on the charger in a few days but still coming in at 23.6v. (maintenance bay isn't close to charging station). Both units are probably 2004 or so. My company got them at auction from a place that was closing down recently so I don't know exactly how old the batteries are, if they've ever been replaced, or if there is anyway to tell. The cells appear to be pretty clean from what I can see when I add water. A slight bit of corrosion but very minimal and not in all cells.