While it is not very loud, if you do not have the charger in the same room, you will not fortuitous it, but believe me, it's extremely annoying ...
At least charging my batteries 18650 works! Relatively well. The charging time is extremely long, however, the Ladegeärt has no particularly high performance. But that's not a problem if you have several batteries and then recharges halt in rotation ...
As I said, apart from the noise, you can use the device / buy. Good price / quality ratio.
Maybe get the manufacturers sometime in the handle)