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Mine will keep doing it even when idling with no programs running

I had exactly the same problem, but then now, the battery just keeps charging way past the threshold, no matter what I set Dell Power Manager to.

Hi, did you manage to resolve this issue ? I am still experiencing this behavior running latest FW, BIOS and Power Manager.

Stano.

I use a workaround:

• In the DELL power manager, enable peak shift
• Change the times to those shown below for one day, then copy that to all the other days. Basically the point is to choose times so that it always wants to use wall power only when you're using your computer.

With peak shift set in this way, your computer won't charge but will use power from the power adapter. When the battery falls below whatever arbitrary percentage you want (it takes a week or more for this to happen), I manually turn peak shift off so that it charges, then I manually turn peak shift back on to stop it.

Hope that helps!

This same thing is happening with the xps 13 9310 I purchased two days ago. I have it custom set in power manager to start charging at 90% and stop at 95%. It charges up to 95%, the charge light goes out, and 20 seconds later the charge light is back on, the battery indicator in lower right corner shows charging, which lasts about 15 seconds. The laptop then stops charging for 20 seconds, and then starts charging again as described above. The white charging light coming on and off, like a Christmas tree light, is driving me crazy! Dell, if you can't solve this issue then please provide a BIOS option to disable the white charging light.  I don't want to cover it with black tape, as it would look tacky. 

Thanks for your help Ultrabook-Hero, but the issue is still here for me

Even if I schedule to use AC without charging the battery, the charging light blinks randomly meaning the battery is charging, then stop charging and so on.

I'm still looking for a fix or an other workaround as I don't think the battery likes this unexpected behaviour (starts charging for 2 sec, then stop during 10 sec, starts charging 2 sec again, ...)

same problem with an XPS 9300. a technical support person entered my computer and reinstalled the application, but in vain. is a bug, dell, are you serious? solve this once. I tried all the above options, the battery continues to charge, after a few seconds in which not charging text appears

UPDATE (ISSUE RESOLVED!):As I well suspected and wrote yesterday, there is a problem with dell power manager software. Well, the technical support wrote to me:  "You need to restart the system and start tapping F2 key when Dell logo appears to boot into BIOS.

Once done, go to "Power Management"> go to battery charge configuration> Choose Custom mode and select the values for the Charge start and stop.

Apply changes and exit from BIOS"

That works! At 55% system stop the charging.