Can anybody has information about what type of cmos/rtc battery is used in HP J3608 or what is the battery specifications

This is normally hitting the Delete key at starting up during BIOS posting. There should be an exit menu where you can load BIOS DEFAULTS. If you can't find it the other way to clear CMOS is to remove the battery. Read the Maintenance and service guide.

Prepare the computer for disassembly (refer to Section 5.3, "Preparing the Computer for Disassembly," for more information).2. Remove the real-time clock (RTC) battery (refer toSection 5.5, "RTC Battery," for more information).3. Wait approximately 5 minutes.4. Replace the RTC battery and reassemble the computer.5. Connect AC power to the computer. Do not reinsert any batteries at this time.6. Turn on the computer

Clearing CMOS will set the BIOS to its DEFAULT setting.

The only "resetting" of a BIOS is setting DEFAULTS.

Web address for the handbook:
http://bizsupport2.austin.hp.com/bc/docs/support/SupportManual/c01041211/c01041211.pdf
If the notebook you are servicing has an unknown password, follow these steps to clear the password. These steps also clear CMOS:1. Prepare the notebook for disassembly (refer to Section 4.3, "Miscellaneous Plastics/ Hardware Kit," for more information).2. Remove the real-time clock (RTC) battery (refer toSection 6.24, "RTC Battery," for more information on removing and replacing the RTC battery).3. Wait approximately 5 minutes.4. Replace the RTC battery and reassemble the notebook.5. Connect AC power to the notebook. Do not reinsert any battery packs at this time.6. Turn on the notebook.All passwords and all CMOS settings have been cleared

I was unable to locate your specific laptop this might ge you some in sight in what to look for and how to remove cmos battery remember some cmos batteries are soldered in
RTC battery replacement procedure on Compaq HP Mini 110 netbook & clear CMOS http://www.youtube.com/watch?v=P_cxAireIsw

If the laptop doesn't keep the correct time, and date, it's because the CMOS Battery is shot.

In the HP Pavilion dv9000 series of Notebook PC's, the CMOS Battery is named RTC Battery. (Real Time Clock )

Replace the RTC Battery.


http://h10025.www1.hp.com/ewfrf/wc/manualCategory?cc=us&dlc=en&lang=en&lc=en&product=1842189&

On the above page, scroll down, and left-click on the file name in blue -
HP Pavilion dv9000 Notebook PC - Maintenance and Service Guide

Ignore the following if you are aware;

This is a PDF file. The computer you are using now has Adobe Reader on it, which uses PDF files.

After you click on the file name it may take up to 30 seconds, before the first page comes up.

At the top of the PDF file is the page number box. It is to the Right of the Down Arrow.
You can use the Down Arrow to go page by page, until you arrive at the page you want, or you can do this;

1) Put your mouse cursor in the page number box.
2) Left-click once
3) Type the page number
4) Press the Enter key

Or you can use the Bookmarks menu to the left.

Go to Page 131.
5.7 RTC Battery

A) Remove ALL power. Remove the AC adapter (Charger) if plugged in, and remove the Battery. (Main battery)

B) I would advise buying an ESD wrist strap, and wearing it.
Connect it's alligator clip to a good ground source.
(Electro Static Discharge)

Average cost is around $3 to $6.

Your body carries Static electricity. Static WILL fry out (Short Circuit) the delicate hardware components inside a computer.
Use an ESD wrist strap, and breathe easier.

Don't know if you have ever replaced a CMOS Battery in a desktop computer before, but the Battery is the same.

It is just soldered to two wires, and put into a small plastic bag that has a cable coming from it, with a connector on the end.

(NO, I do not recommend trying to solder wires to a CR2032 battery! May go BOOM)

http://www.vendio.com/stores/CMOSBATTERIES/item/hp-cmos-battery/replacement-cmos-rtc-battery-f/lid=3032230

The above is from a quick search. Scroll down for laptop compatibility

As you can see in the Service Manual, you need to remove;

1) The Memory Compartment Cover. Page 28
Table 1-8, Bottom Components

Number 6 points to the Memory Compartment Cover.

The RTC Battery is fixed to the laptop with double-sided tape.
New tape should come with the new RTC Battery.

If you have any additional questions please post in a Comment.

Regards,
joecoolvette

Remove the battery by following these steps:
a. Turn the computer upside down with the front panel
toward you.
1. Remove the memory module compartment cover
2. Disconnect the RTC battery cable 1 from the system board.
3. Remove the RTC battery
The RTC battery is secured to the computer by double-sided tape.
Reverse the above procedure to install the RTC battery.

HP Compaq nc6400,,is the bios pin on correct jumpers?

https://support.hp.com/rs-en/document/c00363478

Hello,

Please click here to open the service manual

1.Prepare the computer for disassembly (refer to Section 6.3, “Preparing the Computer for Disassembly,” for more information).
2.Remove the cmos battery (refer to
Section 6.24, “System Board,” for more information on removing and replacing the RTC battery).

CompQ

Below is the guide to resetting the Cmos password. Below that is the link to the service guide the instructions refer to.

Clearing a Password

If the notebook you are servicing has an unknown password,
follow these steps to clear the password. These steps also
clear CMOS:
1. Prepare the notebook for disassembly (refer to Section 5.3,
“Preparing the Notebook for Disassembly,” for more
information).
2. Remove the real time clock (RTC) battery (refer to
Section 5.15, “RTC Battery”).
3. Wait approximately 5 minutes.
4. Replace the RTC battery and reassemble the notebook.
5. Connect AC power to the notebook. Do not reinsert any
battery packs at this time.
6. Turn on the notebook.
All passwords and all CMOS settings are cleared.

http://bizsupport1.austin.hp.com/bc/docs/support/SupportManual/c01234011/c01234011.pdf

If you cannot access the machine after if has been powered up, it is still possible to get past the BIOS password. The BIOS password is stored in CMOS memory that is maintained while the PC is powered off by a small battery, which is attached to the motherboard.

Open the CPU casing locate the CMOS battery in motherboard and remove this battery, all CMOS information (including the BIOS password) will be lost. You will need to re-enter the correct CMOS setup information to use the machine. The machines owner or user will most likely be alarmed when it is discovered that the BIOS password has been deleted.

On some motherboards, the battery is soldered to the motherboard, making it difficult to remove. If this is the case, you have another alternative. Somewhere on the motherboard you should find a jumper that will clear the BIOS password. If you have the motherboard documentation, you will know where that jumper is. If not, the jumper may be labeled on the motherboard. If you are not fortunate enough for either of these to be the case, you may be able to guess which jumper is the correct jumper.

This jumper is usually standing alone near the battery. If you cannot locate this jumper, you might short both of the points where the battery connects to the motherboard.

If all else fails, you may have to clear the BIOS password by resetting the RTC (Real Time Clock) IC (Integrated Circuit) on your motherboard.
Many RTC's require an external battery. If your RTC is one of this type, you can clear the BIOS password just by unsocketing the RTC and reseating it. Good luck!

Hi, try this:
- unplug from mains
- remove laptop battery
- remove real-time clock (CMOS) battery.
- wait 5 minutes
- replace the RTC battery and then
plug in - without the laptop battery.
The laptop battery cannot be present
when you remove the RTC battery
and shouldn't be there when you power on.
Try