Dremel batteries are built for Dremel tools. Outstanding performance starts with power through the B816-01 12V 3Ah battery. At 3Ah, the B816-01 12V battery provides 3 amps of current per hour of use, giving your Dremel tool the additional life it needs to complete your tasks. Including 3 state-of-the-art cells in the B816-01 12V battery, the power output gives you the strength needed to cut, carve, sand, engrave, and more. Compact and lightweight, this battery fits seamlessly with Dremel 8240, 8250 & 8260 models. Driven by technology, the B816-01 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.