Please give us the model number of the laptop. Probably you want to use the HP Battery Check tool
http://h10025.www1.hp.com/ewfrf/wc/document?docname=c00821536&cc=us&dlc=en&lc=en
http://h10025.www1.hp.com/ewfrf/wc/document?cc=us&lc=en&docname=c03325217
The links above are for Windows 7 and 8, respectively. Likely the calibration of the battery is off and running the tool will align the meter with the real remaining battery life so you do not shut off at 45%. If you do not have Battery Tool, with your model number we can link you to the proper download for it.
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