New Dell OEM Original Genuine 9 Cell Battery 451-BBID Type N5YH9 for Latitude E5440 E5540 11.1V 8700mAh 97Wh

Brand New batteries whether OEM or replacement needs to be initially charge of at least 4 hours before using to ensure that it is working. Please take note that constant over charging and discharging of battery will lose its ability to retain charge or will lose the maximum amount of time your battery can hold.