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After my battery died I have replaced it in Authorized Service Provider. This costs nearly 140$. However after replacement I noticed that the weight of my Macbook Pro Retina (Mid 2014) has been significantly increased. Is it something I should worry about or there is a chance that they put some not genuine battery into my device? Is there any way to check this? Has anyone had the same experience?

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    how much does the weight differ from the number in the specifications on the apple site? a charged battery does weigh more than an empty one, but I would be impressed if you could feel the difference – dennismuijs Jun 23 '16 at 12:12
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    @dennismuys, It certainly sounds reasonable that a charged battery weighs more then a discharged battery however I'd love to see some factual quantitative comparative information on the subject. That said, I too would be impressed if one could feel the difference. :) – user3439894 Jun 23 '16 at 12:18
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    @user3439894 it is quite a scientific explanation but here: physics.stackexchange.com/a/34424 :) – dennismuijs Jun 23 '16 at 12:21
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    "...feeling the nanograms..." wow! – klanomath Jun 23 '16 at 12:24
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    Just for the heck of it, I weighed my MacBook Pro Retina, 15-inch, Early 2013, which has a specification weight of 4.46 lbs, on a scale checked with a calibration weight, and it weighed 2006 grams or 4.422473 lbs. So unless you had an accurate weight before the battery replacement to compare with, you might not be able to tell unless the weight differential is appreciable in comparison. – user3439894 Jun 23 '16 at 13:03
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You can check what the weight of the MacBook Pro should be from Apple's specifications and compare with the current weight of your machine. If it turns out that your machine is heavier, you can then do something about it.

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