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Having more than one battery !
Well this is something from my own personal experience . I have seen that many a times people do not have additional batteries , but normally you do not have a charging point anywhere and everywhere , so it is better to have at least one spare because carrying a laptop that isn't running is an additional headache .
Also one more thing is useful when you are traveling by air or traing , you can make use of the spares and go on and on with out being bored .
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