Question about HP Compaq nc6220 Notebook

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Need instructions to take laptop apart to replace bios battery, my laptop is losing time and i think it needs replaced. Can someone tell me how to locate the battery?

My Compaq nc6220 is losing time, so I think the bios battery needs changed. I was able to find the battery in my dell desktop when that one was dying, but I have no idea how to find it on this laptop. It doesnt give instructions in the user manual.

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Here is the service manual for your laptop courtesy of HP:

http://bizsupport2.austin.hp.com/bc/docs/support/SupportManual/c00622160/c00622160.pdf

Look in section 6.3 for dissasemly instructions on how to take apart the laptop.

Then go to page 6-51 of the service manual and it shows you a picture of the BIOS Battery as it looks to be in the top cover.


Posted on May 30, 2009

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How do I remove the Motherboard Battery?


Even if the battery was totally flat, you will still be able to load the BIOS and boot the pc.
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I wish I had better news to give you, but I am fairly certain the Asus mainboard will need to be replaced. The computer Bios is the first set of instructions your computer uses recognize its hardware and perform is initial operations. A power failure while writing new instructions to the bios chip means the computer has incomplete and corrupted basic operation instructions.
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It sounds more like your charger is the problem.... Btw,the cmos battery stays charged for a couple of years. you will notice its dead when booting up your pc loads default settings on in your bios...i.e the time resets each time.

Jul 17, 2009 | Computers & Internet

1 Answer

Laptop not charging the battery


yeah, u tried all the thing which a layman could have done, r u familiar with the use of multimeter??

if so plz, open up the other laptop carefully, switch it on!!

with use of multimeter check the current, n voltage at the battery port.

then do the same with ur lappy.

repeat the thing for 2- times.


if both the reading r same ur battery will be charging but the there a BIOS fault, which can be fixed with little help from techincal support.

n plz tell the does ur lappy run if a charged battery is placed??


as u said the I guess the problem lies inbetween ur lappy n the motherboard.



if the readings r different, then maybe ur charging unit is damaged, kindlly replace it !!

all the best, thank u!!


plz take precautions n a well calibratied multimeter !!

thank u !!

if my solution is appropriate the plz vote me.. thank u!!

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A near flat battery will cause the laptop to lose the time and date even if you change the BISO time and date, it will still lose time.
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I suggest you get a new battery installed before you change the time and date.

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You would have to totally rip apart the laptop to get to it, and on some HP models the batteries are soldered on. Also, on some modern laptops pulling the CMOS battery won't reset the password anyways.
A more effective solution is to call hp and tell them you need to reset the BIOS password on your laptop. You will have to provide them a proof of purchase for the product. After you provide that (usually fax or scan of receipt ) they will give you instructions on how to reset it.

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