For basic computer usage, here are some tips for how to run the computer to lengthen the battery life.
Dim the screen. The screen is one of the largest battery drainers in the system, and we recommend that you dim the screen as much as possible. Ideally, you should run the screen on the first brightness setting for the best battery life.
Turn off the screen when pausing work. One habit that will increase the battery life is to fully dim the display when not in use. For instance, before taking a break to stretch or chat with people, hit the dim key until the screen turns off completely. Then only brighten the screen enough to do the next few tasks and dim it again when done with those tasks.
Turn off keyboard backlighting. The backlight on the keyboard should be turned off unless you absolutely need it.
Put computer in sleep mode when taking long breaks. Avoid turning off the computer, since booting it up will drain the battery. If you are taking a break from your work for 5 to 10 minutes, put the computer in sleep mode. Vostro V131D akku
Disconnect peripheral devices. We recommend you minimize the use of these devices. USB mice, hard drives, and even thumb drives will take some energy to run, and as such, will lower the runtime of the computer. In addition, avoid using the CD/DVD drive.
Control power usage. Use the Power Options to set the laptop to go inactive after a set amount of time. Set adjustments so that the display goes off first.

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