The unit is generating a slight hissing noise when plugged in. Is this normal? It still seems to charge normally.
1073454
After having it for a week, it is quite normal, its hard to sleep with it on but if you are away from the house you can charge the batteries and have a good night sleep.
1073455
I haven't noticed a hissing on mine. I'd contact the manufacturer, in case it's a safety issue. I did once, have a hissing sound on another charger, and that was because we had inadvertently put non-rechargeable batteries on it... yeah, it kind of fried it. Wouldn't work afterwards.
1073456
Check if hissing plugged in without batteries installed , if it does you know its not the batteries hissing. If only hear when charging ,wearing safety glasses, check for a over heated or leaking battery.Use only batteries charger is designed to charge.if all checks out should be OK. I never leave home while charging and have my chargers on a boot tray in work area and check during charging period.
1055428
Not sure, mine never does that. If you just bought it I would swap for a new one. Or make sure your connection to the outlet is not loose maybe? Hope you figure it out!
428774
No, it's not normal, you should send it back, mine has always charged to 100% in the 3 months that I been using it.
1591260
I've had this happen occasionally with mine, particularly as the battery has gotten older. It seems to happen only after it has been plugged in for a long time. Unplugging it and letting it sit seems to clear it. If I don't leave it plugged into the charger for more than a day, I don't see the problem. If your's always does it, I think the battery may be getting sick, or the charging circuit is defective.
149203
I guess I am the odd man out in this one. I love mine. Works good. Are you sure you got a good charge? When the unit is charging you get a visual indication on the screen that it is being charged. If you do not then maybe the connection to your power source is not seeded correctly. I plug mine into a usb port on my windows7 desktop, it recognizes it and starts charging right away.
1470279
Yep. You can get just a tiny bit of electrical noise when it's charging though. Once it's fully charged, or if it's not plugged in, it's VERY quiet / nearly completely silent.
138020
I would recommend a different charger. Mine makes a crackling noise every time I plug it in. It got to the point that I just bought a different one because I was afraid if frying my laptop.
231224
I have never had this experience while the battery is charging. I would say the sound is anomalous.
1596300
Your source is doing that. Try plugging it in a different device. Hiss gone, guaranteed. (Late answer, but might help future inquirers).
897167
I believe it's a malfunction. My charger doesn't make any noises while charging laptop.
1796059
I had trouble with it charging at all. I emailed deerbrook support because it was past the time to return it to Amazon. I sent it back to them and they said they would repair or replace. I would see if Amazon will exchange it since you just got it.
985697
Ooh, i haven't had to charge mine yet, and have had it for over two months now. You might want to return it or exchange it.
1129488
i was having this issue as well...but i read that there is a RED light that turns on when the battery is charging...so i played with the USB that is plugged into the unit, and found that the red light turns on when its plugged about HALFWAY in. i checked, and it IS in fact charging. try adjusting the B side of the USB (mini part thats in the actual unit) before you return it.
2136506
That is what I had awhile back. You will hear a different. There is no more hissing or noise in the background. The copper wall in the card that divide the circuits is a plus to prevent the noise and hissing.
763600
Mine is doing the same thing. Right out of the box. Not sure if it's the charger, the battery or the charge port. Neither USB nor the main adapter charge it at all.
1738661
no, this is not normal. make sure that the unit is properly connected to a source and grounded.
1995600
it is normal. all charge will charge above 1.2V (NiMH rated) for a while.. and that 1.45V will drop back to 1.2~1.25 quickly after you use for 10min.