Peep sounds when working from battery power

Hello
I bought a new HP DV6-1340 laptop
I hear some strange peep sound from the notebook hardware when its working from battery power.
When working from outlet power there is no peep sound from the hardware.
Maybe its because the battery is new or something there wrong ?
Thanks in advance for help

I solved it my self. It was OK (no buzz and fuzz) when it was plugged in (when the electicity line was down once and I was running on the UPS battery).....

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@wheng
‎Thank you for using HP Support Forum. I have brought your issue to the appropriate team within HP. They will likely request information from you in order to look up your case details or product serial number. Please look for a private message from an identified HP contact. Additionally, keep in mind not to publicly post ( serial numbers and case details).
If you are unfamiliar with the Forum's private messaging please click here to learn more.
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Peep sounds when working from battery power

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