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[brose]

I just replaced the original 5 year old on board charger that was dying with a new one that is the latest design. The new charger has a buzzing sound while charging that sounds like a transformer buzzing on an electrical wire or utility power box sometimes can. It is not very loud but definitely different from the soft hum of the original charger. Is this something to be concerned about?

[Richard230]

My new charger doesn't make that sound that I can hear.  However, my hearing is not the best and just I might not be picking up the sound's frequency.    I wish I had a better response to your question. 

[DonTom]

I just replaced the original 5 year old on board charger that was dying with a new one that is the latest design. The new charger has a buzzing sound while charging that sounds like a transformer buzzing on an electrical wire or utility power box sometimes can. It is not very loud but definitely different from the soft hum of the original charger. Is this something to be concerned about?

A low frequency buzzing? Like 60 hz? 

If  it's not loud, (such as being caused by an overload) and appears to be working okay, I would NOT worry about it, as long as there are no other symptoms (such as smell of something burning or excessive heat, CB's circuit breaker's tripping, etc.).

BTW, sometimes something as simple a loose mounting screw can make such stuff  sound louder.

-Don- Auburn, CA

[brose]

The new charger is charging normally and there are no smells. The buzzing is similar to what can occur in other chargers, such as standard car battery chargers. It just caught me off guard since the old charge made a barely audible hum and the new one makes more of the "charger" buzzing sound.
I called Zero and they indicated not to worry, with the caveat of all else behaving normally.
I guess I'll carry on with this charger.