2.0 Laptop and Portable Devices
2.1 Identify the fundamental principles of using laptops and portable devices
Batteries are at the heart of laptop computers. They provide required power to operate a laptop when the laptop is not connected to the mains. There are primarily 3 types of batteries. These are:
NiCad batteries are hardly used these days in laptop computers. The following are the important properties of NiCad batteries:
Nickel-Metal Hydride (NiMH) batteries, unlike NiCad batteries do not suffer from "memory effect" to the extent as that of NiCad batteries. NiMH batteries last longer between charges than NiCad.
Li-ion batteries are being widely used in laptop computers. The advantages of Li-ion batteries are given below:
Typically, a laptop battery provides power for about 2 to 5 hours. If additional power is required, having a secondary battery is recommended. Laptop batteries last for about 1 to 5 years depending on the usage pattern.
lithium polymer batteries (Li-poly) are rechargeable batteries are also being used recently in laptops. The advantages of Li-poly include light weight, non-flammable substance, and longer life.
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