Lets start with the definition of a . Lithium ion batteries are the newest iteration of cordless rechargeable batteries. Lithium ion is the process of lithium moving between the anode and cathode ion. Being the new standard researchers have improved the battery life to a longer standard in contrast to the once standard Nicad batteries. Lithium ion also has a slow loss of charge when not in use.
As for output, lithium Ion battery produce about the same output energy as a NiMH battery but the primary difference is the weight. The NiMH battery weights 20% to #0% more than a Lithium Ion battery. This can and is an important characteristic of both battery technologies. Handling a cordless drill with a NiMH battery can wear down the wrist muscles over extended periods of time.
Environmentally, Lithium Ion batteries are also superior. They don't contain toxic materials such as Cadmium or Mercury. Two components that is present in NiCad batteries. Another positive is Lithium Ion batteries do not suffer from the "memory effect" at all.
The Memory effect, also known as lazy battery effect or battery memory, is an effect observed in nickel cadmium rechargeable batteries that cause them to hold less charge. It describes one very specific situation in which certain NiCd batteries gradually lose their maximum energy capacity if they are repeatedly recharged after being only partially discharged. The battery appears to "remember" the smaller capacity.
For professionals the memory effect is very important as they recharge their batteries often, older drills would require that new batteries be brought sooner in the products life cycle.
Moving onto Nicad and NiMh batteries. The main difference between each of these battery styles is the higher energy density of NiMH batteries as compared to NiCad batteries. NiCad batteries also suffer from Memory effect. NiMH batteries are less prone to suffer from memory effect but the memory effect is not ruled out. NiMH will require less maintenance than a NiCad battery.
Environmentally, NiMH batteries are friendlier on the environment, since they don not contain heavy metals.
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