Three main types of rechargeable batteries are used in newer technology hand held devices. Scientists are constantly trying to develop batteries with better technologies that make them faster, more powerful, and more lightweight. In the past, the only type of rechargeable battery available was a lead-acid battery, which contains liquid and must be kept ventilated in an upright position. Though still used in autos and motorcycles, scientists have developed gel-batteries, where the liquid is semi-solid and will not spill. These batteries, most commonly used in new had held devices are nickel-cadmium (NiCad), nickel metal-hydride (NiMH), and the newest, Lithium Ion (Li-Ion) batteries.
Nickel Cadmium, or NiCad batteries are the least expensive of the three types, because it has the least power. They are primarily used in portable phones, power tools, and other hand held devices. They are more practical than lead-acid batteries because of their increased power and light weight. They also have an advantage over alkaline batteries which are not usually rechargeable. NiCad are said to be the number one sufferer of the memory effect which in fact is really a lazy battery effect,...
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