Battery Notifier is a free and Open Source app that tracks your battery charging status and notifies you when the battery is full, or you need to connect your charger.
AutoPowerOptionsOK is a free power management app that enables you to increase energy efficiency by providing quick access to customize monitor shutdown, the sleep timer, as well as toggling between energy plans at pre-determined times.
GiMeSpace Power Control allows the creation of user-defined power schemes for either saving laptop battery life or keeping your desktop quiet as well as saving electricity.
Intel Battery Life Diagnostic Tool helps IT managers monitor and diagnose the battery life impact of standard IT software built on systems that support Intel vPro Technology.