Notebook displays can be increased or decreased -look for special keys on the keybo'ard - often you'll need to push a function button, toO". Reducing the brightness by as much as you can will squeeze more from the battery between charges. Also, when not using the internet, disable the wireless network adapter to further cut power consumption: look for a switch or key if it's built into the notebook; if it's a USB dongle or plug-in card (PC Card), then remove this prior to switching on the computer.