The Impulse AQ Limited® requires a custom battery pack. If you should require additional battery packs, contact Fisher Research Labs. Fisher® 8 » Searchcoil for Impulse AQ Limited New product, information coming soon Fisher® Padded Carry Bag Rugged double stitched construction. Includes handy Exterior pocket for extra batteries or small Accessories.103693000C Fisher® Battery Pack, 12 Cell NIMH Custom designed NIMH Battery designed for theIMPULSE AQ LIMITED®PI-BATPK-NIM