Dremel batteries are built for Dremel tools for the most best fit and most efficient operation during your projects. Outstanding performance starts with power through the B20V20 2Ah Lithium-Ion battery. At 2Ah, the B20V20 battery provides 2 amps of current per hour of use, giving your Dremel tool the additional life it needs to complete your tasks. Including 5 state-of-the-art cells in the B20V20 battery, the power output gives you the strength needed to cut, scrape, sand and more. Compact and lightweight, this battery fits seamlessly with Dremel US20V and MM20V models. Driven by technology, the B20V20 is built to protect against overheating, overload and unnecessary discharge for ultimate project efficiency, while also operating in cold temperatures down to -4°F. Lastly, having additional batteries can keep your project moving...use one while you charge the other...to help you complete your task without unnecessary stoppage or downtime.