This battery adapter enables you to use inexpensive Ryobi batteries for all your 18 volt DeWalt power tools. This was available on ebay, however ebay pulled the listing at the request of DeWalt and their parent company, The Black & Decker Corporation. They claimed the listing violates their intellectual property rights. I disagree with this decision and will appeal through the proper channels, so please check back here for a link to the re-listing when available. After all if you bought a Ford automobile and converted it to run on natural gas, and then offered that automobile for sale, would that be a violation of intellectual property? (less info)