I used to get 6-8 hours of use on a charged battery, but now a full charge only lasts about3-4 hrs. The only recent change was to add software for a wireless keyboard.

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How long have you had the battery for? Li-ion batteries do have a limited life. If you have had the battery for a while then a loss of longevity is expected. Read this tutorial for info on these battery types.

You may need to pick up a new one online if you find yourself running out of power.

  

Having the wireless on will make the battery run out a bit quicker, but like jp said, li-ion batteries dont last forever, and their charge cycles keep getting less and less time

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