The hard drive, the optical drive and usually memory are the easiest components to replace.
Of the three, the optical drive is probably the easiest... usually one screw.
A laptop if you want a complete computer that you can carry around (there is a CPU in a laptop)A CPU if you have a computer and want to upgrade or replace the "Central Processing Unit" which is the most expensive and complicated component.
The battery is a component of the laptop but is not a part of the Laptop itself.
Is the engine a 3.1? If so it is easist to remove the crossover pipe, then the thermostat housing.
battery
RAM
rectifier. not unique to laptops.
A common internal laptop component that is sometimes designed as a hot swappable device is the optical drive. This depends on the manufacturer and model, though.
If your laptop battery fails or no longer holds a sufficient charge, you can easily replace it. But as long as it is working fine then you don't need to replace it.
Hot swappable means the same thing whether the computer is a laptop, desktop or server. It means that you can remove and replace a drive (hard drive or removable media) while the computer is running.
nets
. RAM MEMORY (IT Essentials Ardware&Software answer)
You can't you can only do that on PC's