I have a hp probook ci7, its 8 months old. recently its battery timing halved and as it was under warranty i got the battery replaced with a new one. The problem is that the new replaced battery shows the same time as the old one i.e. 3 hrs. i have no idea what to do?
In Windows 7 click Start and type Power. In Control Panel you'll see Power Options. For maximum battery life choose power saver. Your laptop should automatically change plans to that when you unplug the power. If your power is plugged in you can use the other options. As Dingo said you can individually choose buttons based on what you use the most.