Problem with CPU load when laptop is charging

Update: When I remove the battery from laptop and connect charger, everything works perfect!

I still have a problem! Can anyone help??

Hello Dvla,

I would suggest few steps would which would help us in isolating the issue further:

1. Check the Battery Health in the BIOS. To enter BIOS Setup, restart the computer and keep tapping F8 key at the Dell logo screen. Check the battery health and make a note of the message. If anything other than your battery is "performing normally", the battery should be replaced.
2. Dell offers a free Battery Diagnostic test, to run the test refer to the Dell Battery Diagnostics site.
3. Also try the suggestions mentioned in article on How to improve your laptop battery’s performance.

For more details, see Laptop Battery FAQs.

Hope this helps! 

Battery test showed that battery is fine.

Just to make my self clear: computer runs slower only in case when battery and charger are both connected!

When computer works only on battery or only on charger ( battery removed) - everything is fine.

Thanks for your advice but didn't worked for me!

Hello Dvla,

I would request you to update the BIOS to the latest version (A13) and check if the issue persists. 

**NOTE: Few things to ensure before updating the Bios is, the Ac Adapter should be plugged in and the battery should have minimum of 15% charge. No other external peripherals should be connected to the computer. Please ensure that the Bios update should not be interrupted else it would damage the motherboard. 

Hope this helps!

Did it, tested it last 3-4 days - no change!

Hello Dvla,

I would request you to check if the issue persists in Safe Mode with Networking. In order to boot into Safe Mode with Networking, please restart the computer and keep tapping F8. From the Advanced Boot Options, select Safe Mode with Networking and press Enter. Check if the computer is running slow. 

I would also like to know if the laptop overheats. If yes, please try the suggestions mentioned in the article on Dell Laptop is overheating. 

Please write back with your findings. 

Hello Allan,

Did several tests in Safe mode:

- Played some youtube video ( 720p) on battery (charger removed) CPU goes up to 25%. Plugged charger during same video - CPU immediately jump to 80% and  continue to  work around that value!!

- Next situation: I removed battery from laptop, plugged the charger,  same video clip: CPU value is good (around 25%) and everything works just fine!?

Any sugestion?

(English is not my native language..)

Thanks !

Hello Dvla,

Thank you replying. I also appreciate your efforts in troubleshooting the issue. 

In order to assist you further, please help me understand if you have tried the suggestions mentioned in the article on Dell Laptop is overheating. If not, please try the steps and check if that helps!

Hello Allan,

I've checked temperature, laptop is not overheating, have latest bios version, i've also reinstalled Windows 7 and even with only necessary drivers, installed in order which Dell recomends - still have a problem!

Thanks for helping me out!

Hello Dvla,

It seems to be an issue with the motherboard. Please consider replacing it. Does the computer have an active warranty? You can check the warranty status here (Enter the service tag, click submit and check for the warranty status). In case of expired warranty scenario, we would not be able to extend warranty entitled services. If the warranty on the computer has expired, you may contact our Expired Warranty Services (this is for US based customers).

Hello Alan,

Is there any other option to fix the problem  before i take my laptop to service? Could it be something else but motherboard? Some bad driver or some  software problem?

Thanks Alan!

Hello Dvla,

Unfortunately, it is an issue with the motherboard and needs to be replaced.

Ok..

Thanks Allan!

Hello Dvla,

Glad to be of help!