Cmos Battery for HP ProBook 640 G1 645 G1 650 G1 EliteBook 840-G1 848-G4

Description

Cmos bios battery (RTC Battery) is for
HP mt40 Mobile Thin Client , TouchSmart tm2-1000 ProBook 640 G1 645 G1 650 G1, EliteBook 840-G1, 848-G4, 6470B 6475B EliteBook 8770w  EliteBook 848 G4 HP dv7t-7000 CTO and ENVY 15-3040nr
(not OEM yet compatible to 23.21212.061 & 23.21212.031  & 914384-001
also for
HP Envy 14 Elitebook 2510P 2560P 2570P Probook 4440s
equipped with # 23.212120.33 , # 651948–001, 739562-001,
23.21212.061
as well as for
Acer Aspire 6920g 6935 8930g
that require a  cable and 2 pin
JST SHR-02V-S-B plug
(again not OEM, rather replacement assembly).
This will work on other brands and models though it's not being listed for other variation model needs that use DBV, KTS, JHT Models 23.21212.061, 23.21212.031, 23.21212.033 (2 pin JST plug)
(Note: aftermarket alternative to the Original Equipment Manufacturer, not OEM, compatible to the Original RTC Battery)
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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.