Latitude C640 Battery Issue ... All I can think of is to check the BIOS settings and/or the Winodws settings to see if the battery has been disabled Otherwise ...

JRJ · 11-09-2009, 10:34 AM

Last week I replaced both the CMOS battery and the laptop battery.
The laptop worked perfectly while running on the battery. Then according to the instructions that came with the battery, I changed all the power settings to never and allowed the battery to completely discharge. I then recharged it fully.
Now however the laptop will not boot up or even run at all on battery power. If the laptop is plugged into the AC adapter, all is well. As soon as you unplug the adapter, the laptop shut off.
The battery is showing to be 100% charged.

Any one have any ideas or suggestion to get the laptop back where it will run on the battery alone?

qhn · 11-09-2009, 10:39 AM

One reason why I never let the notebook batteries running down completely, regardless of what anyone says. They are just like car battery (cells) to me, drain it totally down, and one can have a heck of a time to re-charge (revive) them.

You want to try to put your battery in the freezer for about 15-20 min, in a plastic bag, then take it out for 5 minutes, and try again? I know, charlatan approach

cheers ...

dave-p · 11-09-2009, 11:07 AM

Also

do you have you old laptop battery to see if it does the same thing ?

JRJ · 11-09-2009, 11:16 AM

The old laptop battery would not hold a charge at all.
Also on the new battery, I can push the button and all 5 lights will come on.

dave-p · 11-09-2009, 11:56 AM

All I can think of is to check the BIOS settings and/or the Winodws settings to see if the battery has been disabled

Otherwise you may have a motherboard / DC jack issue

11-09-2009, 10:34 AM	#1
JRJ Registered User Join Date: Nov 2009 Posts: 2 Credits: 221	Latitude C640 Battery Issue Last week I replaced both the CMOS battery and the laptop battery. The laptop worked perfectly while running on the battery. Then according to the instructions that came with the battery, I changed all the power settings to never and allowed the battery to completely discharge. I then recharged it fully. Now however the laptop will not boot up or even run at all on battery power. If the laptop is plugged into the AC adapter, all is well. As soon as you unplug the adapter, the laptop shut off. The battery is showing to be 100% charged. Any one have any ideas or suggestion to get the laptop back where it will run on the battery alone?

11-09-2009, 10:39 AM	#2
qhn ... am invisible Join Date: Mar 2006 Posts: 26,479 Reviews: 8 Benchmarks: 18 Credits: 73,979	One reason why I never let the notebook batteries running down completely, regardless of what anyone says. They are just like car battery (cells) to me, drain it totally down, and one can have a heck of a time to re-charge (revive) them. You want to try to put your battery in the freezer for about 15-20 min, in a plastic bag, then take it out for 5 minutes, and try again? I know, charlatan approach cheers ... __________________ m6805@3700; SZ71WN/C ; Macbook 2ghz/4gig/250gb/superdrive; 7811FX are u Folding@Home? - Firefox Beta - MediaPortal "the" Media Centre/HTPC!

11-09-2009, 11:07 AM	#3
dave-p Loving my Alien :) Join Date: Feb 2006 Location: Ontario, Canada Posts: 14,157 Reviews: 2 Benchmarks: 8 Credits: 102,590	Also do you have you old laptop battery to see if it does the same thing ? __________________ M17x, FX Red, QX9300, Sli GTX-280, 2x256GB SSD, 17" WUXGA, 4 GB DDR3 1333 Mhz 3yr CC M6400, Q9000, FX3700, 8GB DDR3, RGB LED Display, HD, Blu Ray, 1530 WiFi 370 BT, Desktop Water Cooled I7 975 Extreme, X58A-UD3R, 12 GB DDR3, Raid 10, Dell 2707, Blu Ray, GTX 295 CO-OP Copper, Swiftech GTZ, My Dells Vostro 1500, Studio 15, M6300,M1710, E1705,3500,4000,4100,5100,5150,6000, 7000,7500,8000,8500,C410,C610,C810,Cpi,CPx. 6400,1501

11-09-2009, 11:56 AM	#5
dave-p Loving my Alien :) Join Date: Feb 2006 Location: Ontario, Canada Posts: 14,157 Reviews: 2 Benchmarks: 8 Credits: 102,590	All I can think of is to check the BIOS settings and/or the Winodws settings to see if the battery has been disabled Otherwise you may have a motherboard / DC jack issue __________________ M17x, FX Red, QX9300, Sli GTX-280, 2x256GB SSD, 17" WUXGA, 4 GB DDR3 1333 Mhz 3yr CC M6400, Q9000, FX3700, 8GB DDR3, RGB LED Display, HD, Blu Ray, 1530 WiFi 370 BT, Desktop Water Cooled I7 975 Extreme, X58A-UD3R, 12 GB DDR3, Raid 10, Dell 2707, Blu Ray, GTX 295 CO-OP Copper, Swiftech GTZ, My Dells Vostro 1500, Studio 15, M6300,M1710, E1705,3500,4000,4100,5100,5150,6000, 7000,7500,8000,8500,C410,C610,C810,Cpi,CPx. 6400,1501

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11-09-2009, 11:16 AM	#4
JRJ Registered User Join Date: Nov 2009 Posts: 2 Credits: 221	The old laptop battery would not hold a charge at all. Also on the new battery, I can push the button and all 5 lights will come on.

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