The cmos bios battery being offered here are based on a 3 volt 210mah rating system board need, where what is required is a cable and 2 pin plug. The 2 pin plug is a JST SHR-02V-S-B 1.0 mm type that is fitted to a receptacle on the system board for it's integration. The renewal or replacement process might be something that can be somewhat challenging depending on the specific model of notebook, yet in most cases technical manuals will allow the scope of it's replacement process and allow owners to replace and renew the cmos battery. If in doubt, please ask us to assist or redirect you to that source help. Cmos Bios Clock battery (RTC Battery) are for HP Pavilion DV7-7001sr DV7-7001-7006er, HP Elitebook Folio 1040, HP Probook 4441s Acer Aspire 8920 and also suits the repair needs on HP Envy X360 15-W154NR Probook 4440s 4441s # 23.21212.033 or 740187-601 as well as for SONY VPCEG that require a cable and 2 pin JST SHR-02V-S-B plug. This will work on other brands and models though it's not being listed for other variation model needs. (Note: aftermarket alternative to the Original Equipment Manufacturer, not OEM, compatible to the Original RTC Battery) ________________________________________________________________________________________________________ HP equipment, notebooks that came into the public market from 2008 forward, that have the motherboard bios provisions of HP PC Hardware Diagnostics UEFI to test the main components of your notebook computer. This HP UEFI 2008 firmware has a internal diagnostic test that includes a battery health charge level, encompass the ability to alert the end user of the battery charge level associated with the internal battery (10.8v to 11.1v battery that subs for the ac/dc charger 100-240vac) If you have a 601 battery error, contact HP, or replace the internal battery not the rtc cmos battery. HP motherboards nearly never have a charging circuit for the rtc cmos battery. Any attempt to charge a rtc battery can leak and explode due to internal heat pressure, that the rtc battery will never be subjected to in it's internal proper use.