When you close the lid on your notebook and put it to sleep, the computer is still sending some power to the RAM and motherboard in order to keep the current session in memory so your system can wake quickly. Some newer lightweight notebooks such as the ASUS ZenBook UX31 have been designed to use little power during sleep, but most notebooks suck down quite a bit of juice unless they’re completely powered off.
In Hibernate mode, your notebook will save its memory to disk and completely power off, rather than just going to sleep. It will take nearly as long to wake from hibernation as it does to boot, but once it wakes, your session will be right where you left it.
To make your computer hibernate on demand, simply click the arrow next to the Shutdown button and select Hibernate. If you do not see Hibernate available as an option, your computer does not support this mode.
If your computer supports hibernation, you may want to set it to hibernate every time you close the lid.
To set your notebook to hibernate upon lid close:
If your notebook has Bluetooth, you’re probably not using it much. However, the radio is still sucking power, even when nothing is connected to it.
To disable Bluetooth:
If you’re connected to the Internet via Ethernet, or if you’re working some place that has no wireless signal, you can save a lot of power by turning off your notebook’s Wi-Fi radio. Most notebooks have a Function key on the top of the keyboard that toggles Wi-Fi on or off, though some have a dedicated button or switch.
If your notebook has a 5,400- or 7,200-rpm hard drive, it’s sucking up a lot of juice just spinning that magnetic platter around. There are several ways to save power by minimizing disk activity.
Such visual effects as Aero glass, showing window contents while dragging, and slide-out menus tax your CPU and, by extension, your battery.
To disable these effects: