When you are travelling without having many option to charge your laptop, it becomes important that you chose the best power options so that you extend the power to maximum usage possible. If your laptop battery runs out too quickly, you can run the troubleshooter tool to check for any issues on Windows 7. The troubleshooter helps you to optimize Windows 7 for the best power usage. To start the trouble shooter, open Control Panel.
Navigate to All Control Panel Items-> Troubleshooting and under system and security you can see option “Improve Power Usage”.
This will open the troubleshooter, if you want it to fix the problems automatically, click next.
In case you want to fix it manually, click the Advanced link (picture above) and uncheck the box against “Apply repairs automatically” (shown in image below).
After the troubleshooter completes the scan for issues, it fixes problems (in case automatic fix is selected) or displays the issues (in case manual fix selected).
The fix would improve your battery power usage on Windows 7.