Why I can't use my new Acer V5-571G for more than 2 hours?

hi....

As per specification details, your computer is shipped with 37 Wh 2500 mAh 4-cell Li-ion battery pack.

The battery life would be approximately 5 hours.

The actual battery life varies by model, configuration, applications, power management settings, operating conditions, and utilized features. A battery's maximum capacity decreases with time and use.

Calibrating your battery helps get a proper reading on your current battery charge. If your battery is dying before the reported time given in Windows, it could be that you need to calibrate your battery.

The process to re-calibrate your battery can take several hours, depending on the battery lifetime and age, and the configuration of your system.

Use the following steps to to re-calibrate the battery:

1. Turn the notebook or netbook off. Plug in your AC adapter.
2. Let the unit fully charge, until the battery LED turns off.
3. Turn on the computer and press the F8 key repeatedly when the first logo screen appears.
4. In the Windows Advanced Startup menu, select Safe Mode and press the ENTER key.
5. Unplug the unit and let the computer run on battery until it shuts down.