Dremel's 20V rechargeable lithium-ion battery offers power to the MAX. The durable and conductive battery housing protects the cells to keep the battery running cool during use for longer run time. The compact size and weight of the battery makes it the perfect size when powering your tool in any position. An integrated fuel gauge helps checking the charge of the battery quick and easy. Rated to operate at -4°F, working in cold weather is no issue.