Wrong indivcation of Battery Status

Respected Sir,
I'm using the hp pavillion E-015tx laptop and purchased before two months .I have problem regarding the battery status. Earlier the laptop was giving the warnig of battery indication if the battery was remaning  15%. But nowdays the laptop is not giving the warning of the battery of remaning 15% (low battery) and and the laptop goes in sleep mode if the battery status is below the 40-50%  and laptop does'nt start till I plug my charger.
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It seems the first place to start would be to test and calibrate your battery.  Please use this document to test and calibrate the battery in Windows 8.
Let us know what the test says and if after calibrating the battery it more accurately shows how much time is left for the battery to be used.  Does that make sense?
GeorgeFN
I work on behalf of HP.

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