One -battery tools powers multiple tools, from the same range. Once you have the battery and charger, you simply buy the tool to extend your own range of power tools. When you see ‘bare tool’ in the product description, you know it comes without the battery. Having one battery power different tools helps to save money on additional batteries and chargers that you don’t need. If you use your power tools frequently, it’s worth investing in a spare battery to keep your project moving.