Battery suddenly drops from 100% to 94% while charging

[AnhDung]

I bought this laptop last week. When I turn on the laptop and keep using it while charging, after 15-20 mins it drops from 100 % to 94% then the battery charge to 100 %, and everything works fine. This happens every time I start using the laptop.
Is this thing happen normally? If not, what should I do to fix this issue?

I've already searched for this online and found 2 post :

 - https://h30434.www3.hp.com/t5/Notebook-Hardware-and-Upgrade-Questions/New-laptop-battery-drop-from-1... 

- https://h30434.www3.hp.com/t5/Notebook-Hardware-and-Upgrade-Questions/No-battery-detail-percentage... 

but they didn't mention the laptop is charging or not. I also tried to do the solution below but it doesn't work.
Thank you.

[The_Fossette · Accepted solution]

@AnhDung

I reviewed your post and I understand that the battery drops to 94% even when the charger is connected.

Don’t worry, I assure you I will try my best to get this sorted.

The battery stops charging when the battery percentage reaches 100% and it is done to protect the battery from overcharging and it is normal. However, I recommend you update the BIOS from the below link and check if it helps.

https://support.hp.com/in-en/drivers

Let me know how it goes and you have a great day!

P.S: Welcome to the HP Support Community 😊

If you wish to show appreciation for my efforts, mark my post as Accept as Solution. Your feedback counts!

Cheers!

Stay Home – Stay Safe

[AnhDung]

Thank you for your response.  I updated the BIOS but it's still happen. However, it's not happen when I charge the laptop at my school so I think this is because the power socket at my house. 

[The_Fossette]

@AnhDung

Thank you for the update.

If any other questions arise, please feel free to write back to me.

Cheers!