well, there are so many factors that could change the battery performance of the machine you have, i mean to say see though you are having very good machine but still see if you have to make use of the feature such as Bluetooth or WIFI constantly then surely the battery draining will be faster than the usually determined. Thus see if you are making use of any such application then i would say the laptop could strive for 6 to 7 hrs maximum.
But still as there are various factors as mentioned already, so if you work tweaking through those factors then you may get very good performance with the product for sure.
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