We help IT Professionals succeed at work.

Charger drains battery in smartphone

Last Modified: 2013-12-05
I recently bought a new charger for my windows mobile smartphone from a 3rd party cell phone accessories store.  When I connect the charger using the mini USB port it seems to be draining my battery instead of charging it.  Is the charger not strong enough for the phone?  What specs should I look for when buying a new charger?
Watch Question

Make sure the USB cable or Adapter is a full USB.

the USB data cable or adapter does not have power it is only for sync it will never charge your phone (it will drain it).

usb wires has 4contacts(wires)  2 for data and 2 for power

this may be your case

swfasit - the O.P. bought a charger, not a sync cable.

murraybrousseau -
Look at the power specs from the manufacturer.  If you need 500mA supplied from the charger, you can't use a charger with 250mA or 400mA.  The battery drain may be because your screen stays lit up with an "insufficient power" error message.  Sometimes these are universally incomprehensible blinking icons.


what Smartphone do you have?
This one is on us!
(Get your first solution completely free - no credit card required)


Aleghart, would the 400mA charger still work or would it drain the battery?  Or would it maybe just take longer to charge?

400mA charger will probably not charge at all.  It doesn't work for my Blackberry, and that only requires 500mA.

It could be worth checking that the phone isn't being continually accessed. I have an mp3 player which is accessed and also charged via USB, but it seems that the USB connection can't do both at the same time (which admittedly could be due to a limitation of my specific hardware). I recently noticed that when it' was plugged into my laptop and left overnight to charge, the battery would be drained by morning, and it turns out that there was some background process which kept accessing it (it would say on the screen whether it was being charged, read or written to at any time). Switching off that process let it charge normally.

Maybe you have something like ActiveSync running in the background which is keeping your smartphone active', and stopping it from charging. Hope this info is of some help.

any miniusb would be fine if you attach it to your computer

> any miniusb would be fine if you attach it to your computer

But, how does one fit a 24" monitor in a Honda Civic?

Gain unlimited access to on-demand training courses with an Experts Exchange subscription.

Get Access
Why Experts Exchange?

Experts Exchange always has the answer, or at the least points me in the correct direction! It is like having another employee that is extremely experienced.

Jim Murphy
Programmer at Smart IT Solutions

When asked, what has been your best career decision?

Deciding to stick with EE.

Mohamed Asif
Technical Department Head

Being involved with EE helped me to grow personally and professionally.

Carl Webster
CTP, Sr Infrastructure Consultant
Empower Your Career
Did You Know?

We've partnered with two important charities to provide clean water and computer science education to those who need it most. READ MORE

Ask ANY Question

Connect with Certified Experts to gain insight and support on specific technology challenges including:

  • Troubleshooting
  • Research
  • Professional Opinions
Unlock the solution to this question.
Join our community and discover your potential

Experts Exchange is the only place where you can interact directly with leading experts in the technology field. Become a member today and access the collective knowledge of thousands of technology experts.

*This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.


Please enter a first name

Please enter a last name

8+ characters (letters, numbers, and a symbol)

By clicking, you agree to the Terms of Use and Privacy Policy.