IT War Room - Technical Stuff

My laptop starts automatically from hibernation and drains battery - windows 7

1. Open Device Manager by clicking the Start button
2. Click on Control Panel, here click on System and Security
3. Under System, click on Device Manager.‌ If you're prompted for an administrator password or confirmation, type the password or provide confirmation.
4. In the list of hardware categories, find the device that you want to prevent from waking your computer, and then double-click the device name.
5. Click the Power Management tab and then clear Allow this device to wake the computer check box.
6. Click OK.

For example I got issue from wifi hardware. Below you can see image for better info.