HP EliteBook 840 G1 G2 G3 G4 CMOS Battery Orginal

Description

The HP EliteBook 840 G1, G2, G3, and G4 models all require a CMOS battery, commonly referred to as the RTC (Real-Time Clock) battery, which helps to maintain system settings (like time and date) when the laptop is powered off.

Here are some key details about the CMOS battery for each of the mentioned models:

Battery Specifications:

• Type: Typically, a CR2032 lithium coin cell battery is used in most HP EliteBooks, including the 840 series.
• Voltage: 3V
• Capacity: Around 220-240 mAh

Location and Replacement:

• The CMOS battery is usually located on the motherboard of the laptop, and it can be accessed by opening the bottom panel or in some cases by removing the entire back cover.
• In the HP EliteBook 840 G1, G2, G3, and G4, it may be slightly different in terms of positioning, but it will generally be near the RAM or motherboard area.

For each model:

• G1/G2: The CMOS battery is typically underneath the back cover. You’ll need to remove screws and possibly the battery and storage components to access it.
• G3/G4: Similarly, the CMOS battery will be located on the motherboard or nearby components.

If you need to replace the CMOS battery:

1. Power off the laptop and unplug it.
2. Remove the bottom panel (or back cover), depending on your model.
3. Locate the CMOS battery. It will be a small coin-cell battery, often in a holder or connected via a small cable.
4. Replace with a new CR2032 (or compatible) battery.
5. Reassemble the laptop and check the time settings in BIOS.

Important Notes:

• Time/date errors: If you are getting errors about the time or date resetting every time you start the laptop, it’s usually a sign that the CMOS battery needs replacing.
• Data loss: A failing CMOS battery can also cause BIOS settings to revert to defaults, so always back up your critical data and settings if you need to replace the battery.

Let me know if you need more specific steps or help with finding the battery!