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If your laptop is no longer under warranty then your options are much wider. One of the things you should look into is third party laptop battery manufacturers. Most laptop manufacturers don't make their own laptop parts. What they do is accumulate a list of the parts needed to assemble a laptop and then they will assemble their own configurations and sell those configurations under their own brand.Look into third party laptop battery makers if your asus laptop is out of warranty and you need a new battery and you will more than likely save yourself a great deal of money.
Turn down the brightness of your monitor a great deal as it will help preserve battery life;Disable unnecessary programs running on your asus laptop;You may have your applications like Excel or Power Point set to auto-save every few minutes to save your work in progress. Turn off the autosave function while using the battery, but do not forget to save your work occasionally yourself.