Some laptop batteries contain lithium (lithium-ion batteries). Many of the newer models of batteries are lithium-ion because they generally have a longer life both per-charge and general lifetime. However, many older models are made of different materials. The first batteries were nickel-cadmium (NiCd)batteries, which evolved into Nickel Metal Hidride (NiMH) batteries, which then evolved into lithium-ion. Like I said before, the Lithium-Ion are most popular today and are generally considered the best.
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