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Just installed a BlueSmart IP67 12/25 Charger...I noticed when Bulk charging there is a slight sound that all I can think of to describe is "hissing"... as if you imitated a snake with your mouth. Not super loud, but noticeable.
Totally silent in other modes.
Is that normal?
That would be the sound of switching electronics.
I have the same model at home. I do hear it mostly in bulk when it is working hard. Have had it for more than a year with no problems.
It is also more pronounced when the charger is warm.
