![Amazon.com: Rome Tech RTC CMOS Battery for HP EliteBook 640 G1 / HP EliteBook 645 G1 / HP EliteBook 650 G1 - BIOS CMOS Battery CR2032 with 2 Pin Wire Cable (1-Pack) : Electronics Amazon.com: Rome Tech RTC CMOS Battery for HP EliteBook 640 G1 / HP EliteBook 645 G1 / HP EliteBook 650 G1 - BIOS CMOS Battery CR2032 with 2 Pin Wire Cable (1-Pack) : Electronics](https://m.media-amazon.com/images/I/41oTXufQjSL._AC_.jpg)
Amazon.com: Rome Tech RTC CMOS Battery for HP EliteBook 640 G1 / HP EliteBook 645 G1 / HP EliteBook 650 G1 - BIOS CMOS Battery CR2032 with 2 Pin Wire Cable (1-Pack) : Electronics
![Remove and Replace the Real Time Clock Battery on HP ProBook 640 and 645 G2 Notebooks | HP® Customer Support Remove and Replace the Real Time Clock Battery on HP ProBook 640 and 645 G2 Notebooks | HP® Customer Support](https://support.hp.com/doc-images/43/c05324593.jpg)
Remove and Replace the Real Time Clock Battery on HP ProBook 640 and 645 G2 Notebooks | HP® Customer Support
![Remove and Replace the Real Time Clock Battery on HP ProBook 640 and 645 G2 Notebooks | HP® Customer Support Remove and Replace the Real Time Clock Battery on HP ProBook 640 and 645 G2 Notebooks | HP® Customer Support](https://support.hp.com/doc-images/23/c05316356.jpg)
Remove and Replace the Real Time Clock Battery on HP ProBook 640 and 645 G2 Notebooks | HP® Customer Support
![Amazon.com: LeFix CMOS Battery RTC Memory Battery Replacement for HP ProBook 650 G1 G2|640 G1 G3|645 G1 G2|655 G1 G2|725 G4|ELITEBOOK 8470P,8470W,8460W : Electronics Amazon.com: LeFix CMOS Battery RTC Memory Battery Replacement for HP ProBook 650 G1 G2|640 G1 G3|645 G1 G2|655 G1 G2|725 G4|ELITEBOOK 8470P,8470W,8460W : Electronics](https://m.media-amazon.com/images/I/31Ry-DeYqzL._AC_UF894,1000_QL80_.jpg)
Amazon.com: LeFix CMOS Battery RTC Memory Battery Replacement for HP ProBook 650 G1 G2|640 G1 G3|645 G1 G2|655 G1 G2|725 G4|ELITEBOOK 8470P,8470W,8460W : Electronics
![Remove and Replace the Real Time Clock Battery on HP ProBook 640 and 645 G2 Notebooks | HP® Customer Support Remove and Replace the Real Time Clock Battery on HP ProBook 640 and 645 G2 Notebooks | HP® Customer Support](https://support.hp.com/doc-images/920/c05316357.jpg)
Remove and Replace the Real Time Clock Battery on HP ProBook 640 and 645 G2 Notebooks | HP® Customer Support
![Amazon.com: Replacement CMOS RTC Battery for HP PROBOOK 640 250 6465b Replacement CMOS RTC Battery for 4440s 6460b by PCRepair : Electronics Amazon.com: Replacement CMOS RTC Battery for HP PROBOOK 640 250 6465b Replacement CMOS RTC Battery for 4440s 6460b by PCRepair : Electronics](https://m.media-amazon.com/images/W/MEDIAX_792452-T2/images/I/61skl2H6RYL._AC_UF894,1000_QL80_.jpg)
Amazon.com: Replacement CMOS RTC Battery for HP PROBOOK 640 250 6465b Replacement CMOS RTC Battery for 4440s 6460b by PCRepair : Electronics
![Amazon.com: Replacement CMOS RTC Battery for HP ELITEBOOK 8540P 8540W 8440P 8440w GC02000V200 GC02000VS00 by PCRepair : Electronics Amazon.com: Replacement CMOS RTC Battery for HP ELITEBOOK 8540P 8540W 8440P 8440w GC02000V200 GC02000VS00 by PCRepair : Electronics](https://m.media-amazon.com/images/I/614qUo5E+6L._AC_UF894,1000_QL80_.jpg)
Amazon.com: Replacement CMOS RTC Battery for HP ELITEBOOK 8540P 8540W 8440P 8440w GC02000V200 GC02000VS00 by PCRepair : Electronics
![Replace the Real Time Clock (RTC) Battery | HP Probook 640 and 645 G2 Notebooks | HP Support - YouTube Replace the Real Time Clock (RTC) Battery | HP Probook 640 and 645 G2 Notebooks | HP Support - YouTube](https://i.ytimg.com/vi/7I8ur04Suwc/sddefault.jpg)