Battery is a wear and tear component like car tyres which will lose its functionality gradually over time. It is mostly affected by the pattern of the usage such as charging. A faulty battery may cause random shut down or even stopping the macbook to turn on.
It is very common in recent years to have macbook screen broken due to the slim design with sacrifice of durability. Users like students and office workers oftenly carry them in bags which may have damaged it without knowing. Replacement is needed not only when you spot crack physically but also when there are dead pixel lines on your display.
keyboard is a peripheral input device modeled after the typewriter keyboard which uses an arrangement of buttons or keys to act as mechanical levers or electronic switches. Keyboard keys (buttons) typically have a set of characters engraved or printed on them, and each press of a key typically corresponds to a single written symbol.
Mouse is a hand-held pointing device that detects two-dimensional motion relative to a surface. This motion is typically translated into the motion of the pointer on a display, which allows a smooth control of the graphical user interface of a computer.
Computer memory stores information, such as data and programs for immediate use in the computer. The term memory is often synonymous with the term primary storage or main memory. An archaic synonym for memory is store.
Computer data storage is a technology consisting of computer components and recording media hat are used to retain digital data. It is a core function and fundamental component of computers.
Computer hardware includes the physical parts of a computer, such as the case, central processing unit (CPU), random access memory (RAM), monitor, mouse, keyboard, computer data storage, graphics card, sound card, speakers and motherboard.