A key parameter for assessing the overall efficiency of the laptop is its battery life. For the laptop to do its job, it has to stay mobile for longer periods of time while being energy efficient. Well, I would not point out the fact that the whole benefit of the laptop device is in its battery. So, let's understand more about batteries instead. Notebook batteries are made of various materials, mainly NiCD (nickel cadmium), NiMH (nickel metal hydride) and lithium ion batteries. The third is better than the first two in these points: * Li-ion devices are lightweight and compact, allowing for optimal mobility for your device. * They have a higher energy density. * Compared to NiCD and NiMH batteries, Li-Ion batteries have no memory effect, so they are only discharged again in the last cycle. This leads to incomplete charge. If they are not fully discharged, they will suffer a voltage drop. This informs the laptop user about how their battery is discharged be...