Can you use the USB port of a router to charge a phone?

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Can you use the USB port of a router to charge a phone?

Re: Can you use the USB port of a router to charge a phone?
Per Steven Bornfeld:
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Try it.    

Depends on:

- Whether-or-not the router designer supplied 5v to the port

- How many milli-amps the phone needs vs how many are
  available on the port.

I would not expect any of the above....
--  
Pete Cresswell

Re: Can you use the USB port of a router to charge a phone?
On Wed, 19 Aug 2015 19:53:25 +0000 (UTC), Steven Bornfeld

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It likely depends on the router. My Cradlepoint has two usb ports. I
can not only charge a phone from one of them but can also connect to
the internet using USB tethering on the phone. I can probably tether
two phones, but I haven't tried that.

Re: Can you use the USB port of a router to charge a phone?
On Wed, 19 Aug 2015 19:53:25 +0000 (UTC), Steven Bornfeld

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AFAIK all USB ports can be used that way. I've used the USB ports on my
little media player, my A/V receiver (both front panel and rear panel), my
Roku, the USB port on a commercial flight, the Time Warner cable box, the
Uverse cable box, you name it. If it's USB, it has 5V DC @ about 500mA (off
the top of my head, but I think those are the numbers), so it should work
fine. Note that you asked about a phone. Tablets and other larger devices
might try to draw more current than what the port can safely provide, but
phones should be fine.


Re: Can you use the USB port of a router to charge a phone?
On Wed, 19 Aug 2015 19:53:25 +0000 (UTC), Steven Bornfeld

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Since you didn't bother supplying a maker and model number, I'll
simply suggest that you find the maker and model number of your router
and check what the router specifications have to offer.

However, I can make a good guess(tm) that it's 5V 1A output per USB
port.  If the router vendor expects people to plug in self powered USB
hard disk drives, it should handle at least 500 ma and preferably 1A.
However, I don't think the power will charge a smartphone or tablet
that requires 2A.

--  
Jeff Liebermann     jeffl@cruzio.com
150 Felker St #D    http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann     AE6KS    831-336-2558

Re: Can you use the USB port of a router to charge a phone?
wrote:

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Are there smartphones that require 2A? I know of tablets that do, but I
haven't seen smartphones that were that power hungry. Then again, my
experience is mostly limited to a few Samsung Android models.


Re: Can you use the USB port of a router to charge a phone?
wrote:

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Yeah, sorta.  The way they work is that if you plug in a 2A charger,
it will charge at up to 2A.  However, if you plug in a 1A charger, it
will reduce the charge current to 1A.  I've seen mumbling in the
reviews about charging time, where buying a 2A charger cuts is roughly
in half.  However, I don't recall which phones, and am too lazy to dig
it out.

Incidentally, I bought a pile of these USB ammeters, which have been
very handy at checking out charging current:
<http://www.ebay.com/sch/i.html?_nkw=usb+ammeter
<http://www.ebay.com/itm/121721623804
However, I've been too lazy to record numbers because the actual
current depends on the state of charge and battery condition as well
as the charger capabilities.  I believe that I've seen over 1A on a
(not sure) Nexus 5 smartphone but am not sure.  I just tried it on a
half battery Nokia something Windoze phone (running Android apps)[1].
I just measured 1.3A on a 1.5A charger:
<http://www.microsoft.com/en/mobile/accessory/ac-60/
"More power in less time. Up to 35% faster charging for first 30
minutes with an empty battery."



[1]
<http://www.theregister.co.uk/2015/08/18/android_apps_flood_onto_jailbroken_win10_phones/


--  
Jeff Liebermann     jeffl@cruzio.com
150 Felker St #D    http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann     AE6KS    831-336-2558

Re: Can you use the USB port of a router to charge a phone?

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When I've plugged my Lumia err, something smartphone  
to the side of my computah it charges up fine. (Don't have
a USB'ed router).

When I plug it into the jack formerly known as the power  
supply for a cigarette lighter in the car, it beeps at
me and says something like "this is a low current
charger. Please use a higher power one".

However, it sucessfully charges the phone when I've
left the phone in standby. More importanlyu, it supplies
all teh current needed when I've got the phone in GPS/map
display more, which would otherwise drain the battery
in an hour or two...


--  
_____________________________________________________
Knowledge may be power, but communications is the key
             dannyb@panix.com  
[to foil spammers, my address has been double rot-13 encoded]

Re: Can you use the USB port of a router to charge a phone?
Char Jackson wrote:

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The Nexus 5 wall charger says it's 1.2 Amps.


Re: Can you use the USB port of a router to charge a phone?
Jeff Liebermann wrote:

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Its a tp-link archer c5 but none of the specs on the net show the  
current capacity of the two usb 2.0 ports.

http://www.tp-link.com/en/products/details/cat-9_Archer-C5.html
(Amazon.com product link shortened)
http://www.tp-link.com/en/faq-780.html



Re: Can you use the USB port of a router to charge a phone?
On Fri, 21 Aug 2015 17:01:51 +0000 (UTC), Steven Bornfeld

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Well, it says USB 2.0 which is a start.  I'll assume that you can't
measure the current capacity and are in pre-purchase mode.

<https://wikidevi.com/wiki/TP-LINK_Archer_C5_v1.x
The FCC ID is TE7C5
There's a V1 and V2 both of which appear on the same FCCID page.
Plug the FCC ID into:
<http://transition.fcc.gov/oet/ea/fccid/
Find the "internal photos"
Argh... too small to see the USB chip numbers.  Dead end.

I also tried to find an inside photo with Google image search with
nothing useful found.

Here's a review that might show a photo:
<http://www.smallnetbuilder.com/wireless/wireless-reviews/32651-ac1200-router-roundup-part-1?showall=&start=3
There's an inside photo, but not big enough to ID the chip.  

If you're charging a Nexus 5, the charge current is NOT the labelled
1.2A.  That's just the maximum current and usually appears only with a
totally dead battery.  The rest of the charge cycle is much less
current.  Buy one of these:
<http://www.ebay.com/sch/i.html?_nkw=usb+ammeter
<http://www.ebay.com/itm/121721623804
and MEASURE how much current you really need.  Be sure to try it with
a nearly discharged battery.  If it's less than 1A, it will probably
work as a charger.

Under the USB 2.0 spec:
<https://en.wikipedia.org/wiki/USB#USB_2.0
  Battery Charging Specification 1.2:
  Released in December 2010.  Several changes and increasing limits
  including allowing 1.5 A on charging ports for unconfigured devices,
  allowing High Speed communication while having a current up to 1.5 A
  and allowing a maximum current of 5 A.

I doubt that the USB ports on the router comply with this
specification and are more likely to just supply the standard 1.0A
maximum.  At this point, the only ways to find out is to ID the chip,
or find a similar unit and measure it.

Why you would want to charge a phone from a router will remain a
mystery.

--  
Jeff Liebermann     jeffl@cruzio.com
150 Felker St #D    http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann     AE6KS    831-336-2558

Re: Can you use the USB port of a router to charge a phone?
Jeff Liebermann wrote:

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The laptop has all its ports already full, and I don't
always have the wall wart USB handy, and the router
USB ports will be glaringly empty and already right there.


Re: Can you use the USB port of a router to charge a phone?
On Fri, 21 Aug 2015 18:52:00 +0000 (UTC), Steven Bornfeld

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I don't see the problem, at least with wall warts:
<http://802.11junk.com/jeffl/pics/drivel/slides/wall-wart-01.html

--  
Jeff Liebermann     jeffl@cruzio.com
150 Felker St #D    http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann     AE6KS    831-336-2558

Re: Can you use the USB port of a router to charge a phone?
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Any port in a storm, or shortage.

Hotel rooms are prime candidates for a shortage of wall outlets.
I've charge my phone from the back of the TV, and the USB port, which might
be disk-power-enabled, on a DirecTV box.

It might just be handy, too.
I have run out of ethernet, AC and USB outlets in my office.  Too many
Internet of Things in one room.  Oh, and the tortoise is hogging two AC
outlets.

I wouldn't mind having a USB cable dangling from my Asus router
disk/printer port.  It has two... charging might be a selling feature.
And, I could share my phone storage on the network at the same time!

--  
Clarence A Dold - Santa Rosa, CA, USA  GPS: 38.47,-122.65

Re: Can you use the USB port of a router to charge a phone?
dold@16.usenet.us.com wrote:
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My Asus RT-N56U has two USB ports, and one of them is now charging my
Samsung S4.  
Oh... I can 3G tether my phone, so maybe it does provide charging power.
It sees it as a CDROM, though, so no file sharing without some further
investigation.
kernel: scsi 0:0:0:0: CD-ROM SAMSUNG  File-Stor Gadget 0001 PQ: 0 ANSI: 2
kernel: scsi 0:0:0:0: Attached scsi generic sg0 type 5

--  
Clarence A Dold - Santa Rosa, CA, USA  GPS: 38.47,-122.65

Re: Can you use the USB port of a router to charge a phone?
On Tue, 1 Sep 2015 17:17:11 +0000 (UTC), dold@16.usenet.us.com wrote:

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Ok, I guess it's justifiable.  Still, there are better ways:
<http://www.ebay.com/itm/131209278204
Might as well get some exercise while charging.

--  
Jeff Liebermann     jeffl@cruzio.com
150 Felker St #D    http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann     AE6KS    831-336-2558

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