BATTERIES IN LAPTOP

HISTORY OF BATTERIES USING IN LAPTOPS AND PCs

We know that battery is the basic block of a system to operate.
Let us see the history of batteries have been used in Laptops....

NICKEL_CADMIUM (NiCad)

It was the first battery commonly used in older laptops.
They have a life of two hours, but this life also decreases with memory effect.
The problem with this battery is the gas bubbles accomodate in the cell space which blocks recharging of battery.
The only way to get rid of this is to discharge the batterry before recharging.
Another dawback of NiCad is if the battery charges too long, it will explode.

NICKEL_METAL HYDRIDE (NiMH)

It was the second battery that was the bridge between NiCad and Lithium-Ion batteries.
They have longer lifetime than NiCad but in overall case it is slower.
They also suffer from memory effect.

LITHIUM_ION (LiIon)

It is the battery that currently in use.
They are light and have longer life spans.
They donot suffer from memory effect and won't overheat if overcharged.
Many laptops with LiIon batteries claim to have 5-hour battery life.

WORKING OF LiIon:
The electrodes of a lithium-ion battery are made of lightweight Lithium and Carbon.
Lithium is the highly reactive element, that can store lot of energy in its atomic bonds.
The energy stored is translated into very high energy density.
Lithium-Ion battery can store 150 watt-hours of electricity perkilogram.