I'd like to add that you needn't turn on your wireless beforehand. If you're interested in maximizing time between charges, you should simply leave wireless off. Should you "request" an action (like a Wikpiedia search) that requires connectivity, you will be prompted to turn on wireless (without interrupting your query), and you need merely turn wireless off once you're done.
You'll be surprised at how quickly a charge will deplete should you leave wireless on all the time...
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