14.4 Volt batteries come in a variety of styles, including Lithium-Ion, Nickel Cadmium, and Nickel Metal Hydride. Each type of battery has its pros and cons. NiMH is lighter and has 2 to 3 times the capacity of NiCad, but NiCad has longer life cycles. NiCad also performs in temperatures as low as 20 degrees Fahrenheit, while NiMH doesn't perform well in the cold. Then Li-Ion is the lightest, performs in temps all the way down to 0 degrees Fahrenheit and offers even longer life cycles.