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Battery Life Differs Due To Many Factors, Including: Screen Brightness, Power Management, Features, Battery Conditioning, Applications And Other Customer Preferences / 6-cell Notebook Battery For Hp Compaq / Cell Type 6-cell Lithium-ion / Energy Voltage 10.8V / Capacity 4200mAh / Watt-hour Capacity 47WH / Part Number - H6l26AA / FP06 / Compatible Models - HP Probook 440, 445,450, 455 And 470 Notebook PC.