Rebuild Ni-Cd Battery Packs for Power Tools
There are myriad Ni-Cd battery-powered tools and devices, but their batteries don’t last forever, and new batteries often cost more than the tools. But don’t pitch that tool! Many battery packs can be revived by replacing the individual battery cells. In this article, James gives step-by-step instructions for rebuilding a battery pack for an electric drill by spot welding metal ribbons to the battery terminals of the new cells.
Source: circuitcellar.com