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I have some strange questions about my new laptop battery here. I know that two measures that used to state the power rating of a laptop battery is capacity and voltage, but i don’t know the whr. I found the 60WH printed on my battery, and i wonder How long is 60WH last? Is that a 6 hour battery?? the battery detail:http://www.laptop-akkus.com/apple-a1175.html, but i can’t find anything related to the whr on this product. What is the WHr stand for indeed? how long will these lithium ion batteries hold a charge. Does the bigger number mean the longer run time, thanks very much!!!