LeFix CMOS Battery with Lead Cable for DELL Latitude E5440 E5450 E6440 E6420 E6230 E6520 E7440 E7240 Alienware M18x M18xR2 14 R1 18 R1 13 17 R2 15 R1 15 R2 17 R3 13 R2 15 R3 17 R4

Always got wrong date and error message when you turn on your laptop? Even the Windows XP can't be loaded correctly? (Windows XP can't be loaded correctly when the Date setting is no sense, this could happen when the CMOS battery voltage is low). Then it is time to change your CMOS RTC coin battery! Every computer has a small coin cell battery to power the BIOS chip to keep the date, and other internal settings effective. Without these cmos batteries or a dead cmos battery these internal setting will not function. CMOS RTC battery should be replaced every few years (typically 3-4 yrs).