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-   -   Beware of cheap USB wall chargers!! (http://www.diychatroom.com/f13/beware-cheap-usb-wall-chargers-177643/)

spaceman spif 04-20-2013 12:01 PM

Beware of cheap USB wall chargers!!
 
Several weeks ago I woke up one night because my cell phone, which was charging next to my bed, was making weird noises. I looked at it and was stunned to see it was opening and closing apps at random! I kept touching the screen to stop it, and it wouldn't respond to anything I did. Next thing I knew it opened up my recent call history, picked a number and dialed it! (It was interesting trying to convince my gf I wasn't drunk dialing her at 1:30 in the morning). It finally stopped acting whacky when I yanked the charge cord out.

I later found out that the $5 USB wall charger I had just bought was the culprit. That night was the first night I plugged the phone into it. I did some research and found that apparently some cell phones (mine is a Droid Razr) are sensitive to the proper voltage coming from the charger, and if the charger isn't quite providing the right voltage, the phone can act up.

GBrackins 04-20-2013 01:15 PM

amazing, thanks for the post spif!

venator260 04-20-2013 01:56 PM

Yep. My phone does that as well.

I've found it to be based on the outlet used as well. Where I work, I can't use certain outlets, even with the charger that came with my phone. Other outlets in the building and the outlets in my house are fine, however.

user1007 04-25-2013 08:16 AM

Just because the cords fit does not mean the voltage is correct. You should always check the output of the charger matches that the phone is set up to deal with.

It may not have been that the charger was cheap. Just outputting the wrong voltage.

We all do it I guess but it we might be better off charging with the device off!

joseph101 03-13-2014 06:26 AM

Thanks for sharing but i never go for cheap usb wall chargers....

sixeightten 03-13-2014 06:33 AM

We have been using the cheapie chargers for years. $5 instead of $30 is huge when you have 4 phones in the family. Never had any issues other than an occasional short life span of one charger.

TheBobmanNH 03-13-2014 11:17 AM

Quote:

Originally Posted by user1007 (Post 1166828)
Just because the cords fit does not mean the voltage is correct. You should always check the output of the charger matches that the phone is set up to deal with.

It may not have been that the charger was cheap. Just outputting the wrong voltage.

We all do it I guess but it we might be better off charging with the device off!

While I agree with this in most cases, USB is supposed to be a standard 5v. Nothing in the USB form factor should be outputting a different voltage.

mbender2004 03-23-2014 11:36 AM

I think of it like this, you get what you pay for.

McSteve 03-23-2014 08:11 PM

What causes this is usually EMI/RFI transmitted along the USB cable from a poorly filtered power supply. It screws with the phone's capacitance touch screen, making it think someone is touching it.

r0ckstarr 03-30-2014 07:52 AM

When my girlfriend used her Zune charger with her Android phone, her phone constantly rebooted itself.


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