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Generally, User will feel more sensitive about the life time of a HP Pavilion dv9274EU laptop battery.In fact,there is a Formula to calculate the life time.It is : Usage time= Battery power/ Total power consumption. As we know, Total Power consumption could be got from Parameter table. But Battery power need to be calculated. Calculating Battery Power also need a formula.That is : Laptop Battery=Battery volume * DC voltage. These two parameter could read from your battery.

For example,This laptop battery volume is 5200 mAH (5.2 AH), DC voltage is 11.1V. So Battery Power is 5.2 AH * 11.1V=57.72 WH . Thus, To calculate Battery lifetime, We generally calculate like this example:

For example, Laptop battery Total power consumption is 10W, Battery Power is 57.7WH, Then the usage Time=57.7WH/10W=5.8H.