Lithium-ion batteries are currently the most used type of battery for powering a wide range of electronics, from earbuds to phones and laptop computers. A Li-ion battery holds several advantages to other competing battery types, such as the nickel-cadmium battery. Because they can store much more energy in a small package, they are considerably energy-dense. They are also able to output larger amounts of current, and boast longer battery lives. Furthermore, unlike Ni-Cd models, Li-ion batteries don’t use cadmium, which is a toxic element.