Doesn't come with battery, but uses the same one that came with the other Nextec deals. Summary from site:
Powered by 12 Volt Die-Hard Lithium-Ion Battery(Sold Separately). For enhanced performance and longer shelf-life. Clear Poly Carbonate Lens directs and focuses light to eliminate shadows or blind spots. The lens has a unique contour to throw light forward and outward to provide a full range of 331 degrees of light. Fluorescent Bulb is long lasting 13 Watt, 300, lumen energy star, rated bulb lasts 12 hours on a single charge. Telescoping Hook has an easy to use integrated rubber coated hook that can conveniently be extended up to a full 6 inches and rotate a 360 degree. Fuelgauge utilizes Green, Yellow or Red LED lights to indicate the amount of charge remaining. Integrated magnets designed to easily attach to any metal surface under the hood, in the home or on the job. 1 Year / 90 Day Warranty.