Batteries and Chargers stocks a large selection of Cordless Tool Batteries and Battery Chargers. Batteries produce electricity from a chemical reaction. Cordless Tool Batteries have improved dramatically in recent years with the advent of Lithium Ion Technology. The advent of Lithium Ion Batteries has dramatically increased the run time of today’s new cordless tools. Nickel Cadmium Batteries are still a less expensive and viable alternative to Lithium Ion Batteries. However, when choosing replacement batteries for your Cordless tools make sure that you select the correct Charger. Another important note is to select the correct voltage battery for your tool.