Question about Dell Latitude C640 Notebook

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Dell c640 none charging battery

As i read on some forum,theres 2 batteries in this laptop,need some explenation on this,i know there a big one in the front but i think is not working no more,if the battery indicator is suppose to come on when it charge,because mind doesent come on at all . is the laptop the problem or dead battery,but the laptop is working with the ac power cord,and the small one inside is for what tank u very much sir

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  • Jean Martin
    Jean Martin Jan 05, 2009

    tank you sir,it recognize number 1 the big one ,but i got a big red X on the battery and for number 2 said missing ,i dont understand

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My Dell notebook battery has 5 led's and a small tab (button) you press to see how much charge the battery has in it. Take yours out and look.

Posted on Jan 05, 2009

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A small battery is used on main board to maintain the clock and normally is supposed lasting many years (5/7) You must change it when date and time on your PC start loosing synchronicity.

Posted on Jan 05, 2009

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The small one inside is for saving the BIOS data and the Internal Clock as just like in a regular desktop. That shouldnt need replacing unless its just very old. But even if the internal battery goes bad, it should still charge and work.

If the charge light isnt comming on, then its most likely the mother board went bad or the battery. Power it on and when in windows, right click on the desktop, click Properties.

Go to the screen saver tab and at the bottom, click the power options, go to the battery and see if its even detecting it. If it doesnt detect it at all, its probably a bad mother board or connector. Even a dead battery would show.

Posted on Jan 05, 2009

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1 Answer

Dell c640 battery not charging


If the laptop battery is more than 3 - 4 years old then the battery could be worn out. Rechargeable batteries have a finite number of charge and discharge cycles and will lose their charge capacity over time, i.e. won't charge to 100% and gradually the charge reduces until the battery won't charge up at all. OR The battery shows a 100% charge but when the adapter is disconnected the battery drops off to zero capacity in a very short time. If the battery drops to an unacceptable charge level then the battery needs to be replaced. Rechargeable batteries will fail if stored in a discharged state for long periods.

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The battery has a dry cell causing this so replace the battery

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Occasionally a defective battery will show charge and not work at all. HP has the same problem on some models. Try a different battery and if it works, then the battery is defective.

Oct 25, 2009 | Dell Latitude C640 Notebook

1 Answer

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first, check that the battery connection isn't blocked by a sticker or something.
second: try disconnecting the battery and ac and hold the power button for 1 minute. then give the battery and ac another try.

let us know how it goes.

if it still doesn't work, time for a warranty replacement.

Jun 30, 2009 | Dell Latitude C640 Notebook

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Dell latitude C640 laptop battery will not charge. Got a new?? battery but it won't charge either. I am able to run on A/C power just fine.. When I got the computer (used) the battery worked fine... what...


Try taking out battery and plug in power. If it works, battery is faulty. If not,
Try taking out your hard disk plug in power, if it works, hard disk is faulty. If not,
Try taking out memory card, if there's a sound, memory card faulty. If no sound, it's your motherboard that is causing the error.

Note: If machine is under warranty no need to pay for the repairs.

Jun 08, 2009 | Dell Latitude C640 Notebook

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Dell c640 charging problems.


Instead of spending alot of time trying to do something that could potentially harm your laptop..why not just buy a power supply?

You can get one here Click here for about 16 dollars. That's a great deal they are usually about $60 and its a Dell brand not some off brand.

Good Luck

Jan 18, 2009 | Dell Latitude C640 Notebook

3 Answers

Dell c640 not charging battery


I have found a few things with this model, first if the laptop works on ac power when the battery is out then try pushing the button on the battery itself and see how many lights light up. If they are not green replace the battery it just wore out. Second if you can wiggle the power cord and you see the charge light flash on and off then the solder joints are cracked on the main board and you will have to take the main board out of the case and drill out the 3 rivets on the metal bracket covering the plug and bend it out of the way then there are a small brown and a small black block near the plug resolder the ends of these facing the plug. bend the bracket back into place and epoxy it where it was. put the main board back in the case hook all the stuff back up and now it will charge your battery. If you are not good at this stuff I would not try it yourself. I have fixed 2 c640s this way and it is slow careful work.

Jun 24, 2008 | Dell Latitude C640 Notebook

7 Answers

Battery will not charge


I purchased a Genuine Dell Battery, It arrived dead with 1 test light on battery itself at 0% charged, It only lasted 2 mins before the laptop died running on battery, It doesn't charge the Dell battery at all The replacement battery only shows a 1% charge every 7 hours or so, nor do I have a yellow, green, orange light, The only time I get a light on the battery led is if i'm running on batteries and the battery level is below 10%, Its orange for low battery.
Thanks in advance to anyone who could help me.

Oct 31, 2007 | Dell Latitude C640 Notebook

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