Wall charger vs USB charger

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Hi,

I have noticed my phone charges much quicker via the USB on my PC. It takes about 2 hours to charge fully, while the wall charger takes 3-5 hours to charge like 40% or something.

The specifications for the wall charger are:
INPUT: 100-240V ~ 50/60Hz 0.2A
OUTPUT: 5.1V=== 850mA

I do'nt know what the specs for my USB port are? Can I check it in the BIOS? I have googled and found it's something around 5V 500mA, so technically my phone would charge slower...

This is how the wall charger looks like (you can unplug the USB-cable and use it on the PC since it's not a standard USB-mini connection).





Thanks for any feedback.

EDIT:
(moved a post to this thread)

Originally Posted by Cocide

Well the 500mA is the minimum spec for USB, basically they say its at least 500mA so that manufactures know how much power to expect and can design devices to run at that amount of power or less. That being said, USB can be anything above 499mA, I have seen a laptop put out 2000mA before even. So yes it is quite possible that your computer could put out over the 850mA of your charger. It probably won't say what its capable of delivering in your BIOS, if you really want to know you could try to find the specs for your computer/mobo/usb chipset. All that being said, you could always get a different USB wall adapter if you wanted to charge faster w/o a computer, just because it came with the one you currently use doesn't mean you have to use it (it is just a powered USB port after all).

Seems like your wall charger is defective, normally It takes about 1.5-2 hours for working wall charger to make the job done.
Standard PC USB port output is 5v==500mA, so it's strange that you can fully charge 1140 mAh battery just in 2 hours.

Originally Posted by G1-Amateur

Hi,

I have noticed my phone charges much quicker via the USB on my PC. It takes about 2 hours to charge fully, while the wall charger takes 3-5 hours to charge like 40% or something.

The specifications for the wall charger are:
INPUT: 100-240V ~ 50/60Hz 0.2A
OUTPUT: 5.1V=== 850mA

I do'nt know what the specs for my USB port are? Can I check it in the BIOS? I have googled and found it's something around 5V 500mA, so technically my phone would charge slower...

This is how the wall charger looks like (you can unplug the USB-cable and use it on the PC since it's not a standard USB-mini connection).





Thanks for any feedback.

USB spec calls for 5V, 500mA max output (it's often less - reason is that it's 500mA per hub and in must configurations multiple ports share a single hub internally so multiple devices all plugged in at the same time will share the 500mA).

Your charger should charge in about half the time of your PC USB. Your wall charger must be defective.

Originally Posted by richb500

USB spec calls for 5V, 500mA max output (it's often less - reason is that it's 500mA per hub and in must configurations multiple ports share a single hub internally so multiple devices all plugged in at the same time will share the 500mA).

Actually you got that backwards, its 500mA minimum. Check the docs if you do not believe me. And before you quote it, yes I do know that wiki says "A maximum of 5 unit loads (500 mA) can be drawn from a port in USB 2.0" that is because they are talking about the maximum that you are guarantied to receive as a USB device. You really need to read both sides of the documentation for this one, the USB protocol documentation for the computer side says it will provide 500mA minimum, and for the device side they say draw 500mA maximum. That way manufactures know that they can draw 500mA maximum to fully power the device because they are guaranteeing that they will be given at least that amount or more. Often times ports will actually put out more because manufactures are aware that devices charge over USB, and of course you can have ports that do deliver less because of some extenuating circumstance.

Granted that is all per port (and internal USB bus is not the same as a USB hub, they often provide full power per port), if you have a hub you are using it can be less, but you can not assume its a hub.

Long story short, if it has the USB sticker on it it puts out at least 500mA all the way up to whatever the manufactures prerogative was.

Wall charger charges much faster in my case. Just a little more than 1 hour.

The charging time is depend on the charging current. Wall charger is around 850-1000ma, usb is below 500ma (for some bad PC, it could be as low as 200ma). The capacity of the flipout battery could be 1130mah. 1130/1000 = 1.13 hour full charge time.