Inside man

Feb 3, 2017
I have a problem with my HP 15-r249tu, windows 10 laptop. It needs to be plugged in to start, after that if I unplug, it works, the battery icon show empty, but clicking on it show's 100% battery.

Earlier I had a different battery issue, when ever I charged the battery and it shows 100%, fully charged, I unplug and the system would shut down. Only after plugging it in, it would restart, then after it would work even when unplugged. SO immediately after charging, on unplugging it would shut down. No problems after pluggin and restarting.

I contacted HP support and the support, did some troubleshotting steps but did not solve the problem.

Now I can not start my laptop without plugging in. Also the laptop does not shuts down like before when unplugged. The HP support were of the opinion that battery needs replacement. But I dont agree, as ican use the system for a few hours after unplugging, and the problem started after some times of ungrade to windos 10. (No option of going back to win-7)

My laptop has the old UEFI with no component option, so I will download new UEFI from HP site on a USB and run the test. However I did run the test using the HP assisant yesterday itself, and the result was Charging (67%), Primary battery OK(0). cycle count 197/300, design capacity-1692, full charge capacity-1692, remaining capacity-1125, current-1723

But today running the same test showed Unkown-Primary battery unknown(90), HP battery was unable to access the battery, PLease shut down the PCand reinsert the battery and AC adapter. Please verify that you are using the latest version of HP battery check and the latest BIOS version.

During my previous communication with HP UEFI test were run and it was also found ok. see below

Model: HP 15 Notebook PC
Serial Number: CND505****
Product ID: L2Z88P****
CSO Number:
Agent ID:
Start Time Type Result Failure ID
------------------- --------------- -------- ---------------------------
2017-01-03 17:29:44 Video Passed NA
2017-01-03 17:28:43 Video Passed NA
2017-01-03 17:27:59 Processor Passed NA
2017-01-03 17:27:06 System Board Passed NA
2017-01-03 17:24:01 Battery Passed NA
2017-01-03 17:07:14 System [E] Canceled NA
2017-01-03 16:53:00 AC Adapter Passed NA
2017-01-03 16:51:54 Battery Passed NA

Recent UEFI results:
UEFI results:

AC adapter-Passed

Battery check: did not progress 1%, waited for 10-15 minutes, but justdid not move beyond initiall 1%, so stopped.

After I restarted, the icon show empty, plugged in but not charging and clicking on it shows battery at 100% fully charged.

I unplugged the system and have been using the laptop for 3 hours and 40 minutes now on battery.

This is not a faulty battery issue, but some software issue.

Kindly find some solution. I have tried to uninstall and reinstall the battery drivers, remove the battery and reinsert it, it works sometimes, but then again the same problem. Every time I need to start the system or re start after shut down it need to be plugged in.

BIOS version/date-Insyde F.40, 7/26/2016
SMBIOS version -2.7

The above BIOS was updated by the HP support, but did not solve the problem. My model laptop on HP site says the lates BIOS is F.40 Rev.A, I am not sure what to do.


Jan 3, 2015
It's the battery or the internal power components on the laptop.

The firmware on each device is exactly the same yet you're the only one having issues? I'd be doubtful that's the case, it's most definitely a hardware failure.

Inside man

Feb 3, 2017
If its the battery why can then I use the system for over 3 hours on battery.

And after plugging in and starting the system, and then unplugging it, it works....also after the battery is drained, I can charge it again (let it charge for about 1-2 hrs) and it works. So if the problem is internal power components then should it not do any of the following -
1) Not charge the battery?
2) Should shut the system down after unplugging every time?
3) Work only on when plugged in.....?


Jan 3, 2015
Integrated Circuits are complicated things. All it takes is one bad silicon alignment and undesirable behavior such as this can occur.

The reason why is heavily based of computer science and how the crystal lattices function. But, computer science allow it to be a bad chip or another component in the circuit. Just remember, electricity is just electrons and positive and negative charges.

That's the most basic level of computer science. It could definitely be the battery.
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