Amazon.com: LeFix Replacement CMOS Battery for DELL Latitude D620 D630 D810 D830 E6420 E6430 E6520 E6530 E6540 N4050 E7270 M4600 with 2-Pin 2-Wire Cable(Yellow) : Electronics
Amazon.com: LeFix CMOS RTC BIOS Battery Replacement Compatible with HP 820 G1 640 G1 CR2032 with Connector 2 Pins 2 Wires 1.0mm Pitch : Electronics
Amazon.com: 3X Panasonic CR-2016/F2N 3V Lithium Coin Battery SMD (SMT) Tab for PC CMOS CHECKSUM Failure Battery State Low, System Options NOT Set, TIME Date NOT Set Display Type Mismatch, Memory Size