There is a company on the internet that rebuilds batteries. That does not seem to be a good deal as they are almost the same price as I can get them new. However they will also rebuild them with super high capacity batteries giving (I think) 50% more AH. True they do cost more. I wonder if they are heavier? Has anyone tried one. I was going to do it with a Dewalt battery, but seems I lost it somehow. Amazon has some new but "not in consumer packaging" for a decent price.