Does anyone know if there is an adapter for the older 14v Dewalt tools to accept 18 volt or 20 volt battery packs? I have several 14 volt Dewalt tools that need new battery packs. I know I can have the 14 volt battery packs rebuilt, but the cost is pretty high. Since these are older tools that are still fully functional I hate to toss them, but at the same time since they are older tools I hate investing $120+ in new battery packs only to have one or more of the tools die leaving me with useless battery packs.