NiMH batteries
should be drained completely before recharging.
Li-ion and NiMH batteries are both rechargeable batteries that are frequently used in laptop computers. When searching for Lithium-ion or Nickel-metal hydride batteries, you will want to consider the cost, weight, discharge rate and environmental impact of each type of battery before making your decision. If properly cared for, both Li-ion and NiMH batteries will have a long life.
Cost and Weight
Lithium-ion batteries weigh 30 percent less than NiMH batteries, but they also cost substantially more than NiMH batteries. Because Li-ion batteries weigh less, they are less cumbersome to carry around in your laptop carrying case and will make traveling a little easier.
Memory Effect
Batteries affected by the memory effect will gradually lose their ability to charge when the batteries are charged before they are fully drained. NiMH batteries are affected by the memory effect. These batteries will gradually lose one to two percent of their power per day, even if they are not being used. Lithium-ion batteries do not suffer from the memory effect and will retain their charge even when they are not in use.
Discharge Rate
Many laptop batteries are not fully charged and discharged every time they are used. Instead, laptop batteries tend to have a small charge and discharge cycle. The smaller charge and discharge cycle allows you to use your laptop without worrying about your battery life. NiMH batteries perform at their peak rate when they are fully charged and then discharged. A Lithium-ion battery will allow you to charge and discharge your battery whenever it is most convenient, as there's no benefit to waiting for it to fully discharge before plugging it in to charge again. NiMH will work for fewer charges than Lithium-ion batteries.
Environmental Impact
NiMH batteries do not contain heavy metals. These batteries are considered environmentally friendly compared to older NiCad batteries. Li-ion batteries contain a high percentage of heavy metals and are considered hazardous. Lithium-ion batteries must be recycled or disposed of properly to prevent contamination from occurring.
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