They include zinc carbon batteries, alkaline batteries, button cell batteries, and lithium batteries. Alkaline batteries can last up to ten times longer than zinc batteries but may cost three to five times more. Button cell batteries are small, disc shaped batteries commonly used in hearing aids, medical devices, watches, calculators, and cameras. Lithium batteries can last about twice as long as alkaline batteries but are more expensive. Lithium batteries are labeled as such to distinguish them from other battery types.
Secondary batteries are rechargeable batteries.
They are available as freestanding units or as built-in components of rechargeable devices. The free standing units are expensive but save money in the long run since they can be recharged many times. They are the best for devices that get regular use. Nickel Cadmium is the most common type of rechargeable battery. They may be built into rechargeable appliances or sold as freestanding units.