The battery has a voltage of 10.8 V and 4,400 mAh capacity, giving about three hours of general usage. Obviously, this time depends on several factors, such as CPU usage, screen brightness, optical drive usage, etc.
Opening the bottom cover (you only need to remove two screws), you have access to the compartment where there are the hard disk drive, wireless network card (that uses a mini PCI Express slot), and the two memory sockets, in addition to the CMOS memory battery. This means that a memory or hard disk upgrade is simple and quick.
The hard disk drive that comes in our equipment is a 500 GB, 5,400 rpm, SATA-300 Hitachi model, part number 5K500.B.
The memory that comes with our 5742Z is a single 2 GB, DDR3-1333 (PC3-10700) module from the brand Micron. The bad side of having only one memory module is that the CPU cannot access the memory on dual channel mode, which can duplicate the maximum data transfer bandwidth. The good side is that you can upgrade the memory amount just by installing a second memory module. The Aspire 5742Z accepts up to 8 GB, in two modules of 4 GB each.