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I think we need an article at USB charger or similar, giving a simple overview of the USB chargers available and what they're good for.
I have a Samsung Galaxy mini smartphone and it will charge from intelligent ports and dumb 1A ports but not from dumb 2.4A ports. Took me ages to work out what was going wrong. Many of the chargers available in Aus offer only dumb 2.4A ports. NBG. Andrewa (talk) 12:02, 27 January 2017 (UTC)
buried in details
i concour with the above comments by twotwos (talk) 22:06, 10 January 2017 (UTC) and 184.108.40.206 (talk) 17:29, 26 January 2017 (UTC). confusing and buried in details the article felt during reading. a clear overview (perhaps in table format) would contain: usb socket/plug name - starting year - which socket/plug it fits (with a warning if such pairing is only physically possible but not functional!) - data speeds available - power output available through this connection - miscellaneous information.
an image of 6 different usb endings with no apparent time order and a list of their names in the picture text is just sub-optimal. it would be better to post images by one type (pair of plug and socket) at a time and put them under the relevant sub paragraph dealing with their description. 220.127.116.11 (talk) 13:19, 5 March 2017 (UTC).
USB_konektory.png incorrectly shows the USB micro-B connector
the micro-B connector is incorrectly drawn. the connections are displayed on the opposite side of the plug and upside down.
NO micro-B cable will fit the diagram in USB_konektory.png that displays the micro-B incorrect layout.
You can verify this on the photo of a real micro-B usb connector at this URL:
https://encrypted-tbn1.gstatic.com/images?q=tbn:ANd9GcSUO3I53I7X1Q_rkOI8MY5iQ5zVqwgZVpN1HygpEdp0308pKEXk — Preceding unsigned comment added by 18.104.22.168 (talk) 01:37, 8 March 2017 (UTC)
USB chargers 2
There's a lot of information either not in Wikipedia or at least not accessible to the layperson who is likely to be looking for it.
My Samsung Galaxy Mini for example will not generally charge at all from a 2.4A dumb port, or from 240V chargers that come with other brands of 'phone. It will charge from a computer USB port, or from a 1A dumb port. Many other devices are also a bit finnicky I am told. A friend left her charger at my home, 4 hours drive from mine. I told her to charge her 'phone from her computer (she had a suitable lead, used with her car charger) but it was terribly slow. I'm unsure of her 'phone details, I will find out.
Recently there have come on to the Australian market chargers (both 12V DC for use in cars and 240V AC for use at home etc) which have multiple charging ports of different types. I have an in-car device from Aldi which has both 2.4A and 1A USB ports, and only the 1A port charges my 'phone. I have a 240V "Click" charger ("Click" is a Bunnings house brand) with 1A, 2.4A and smart "I/O" ports and again my 'phone will charge from any except the 2.4A port. The packaging of this "Click" charger claims it will charge anything, and it has not failed yet, but it's a matter of knowing which port to use. There are also chargers built in to GPOs, again of several sorts. I'm about to install one that comes with "high and low power" USB ports, and instructions that if one of the two ports doesn't work with a particular device, just try the other. 
This OR doesn't belong in the article of course. But this and similar information would be appreciated by our readers I'm sure once properly sourced. http://www.iec.ch/newslog/2011/nr0311.htm is a good place to start. Andrewa (talk) 08:41, 24 March 2017 (UTC)
I think this section, and the associated picture, should go. The article is complex enough without pulling in the 101 hacks and non-standard stuff people may have come up with. I don't see evidence that this or any others have acheived any sort of cross-over to 'defacto standard' level. Any strong objections? Snori (talk) 07:13, 24 April 2017 (UTC)
It would be useful to be explicit about what upstream/downstream port/device mean. The information is in the article, but it takes some parsing to make sense of it, because at first it's confusing, and looks inconsistent. I suggest something like the following text, either in the Overview, or in ‘Standard Connectors’, or in ‘Power’:
Power flows from ‘upstream’ devices to ‘downstream’ devices. An ‘upstream port’ is (possibly confusingly) on the downstream device (‘facing up stream’, as it were), and vice versa. The A plugs are intended to go into upstream devices and the B into downstream, so that power flows from A to B, though this principle is not applied completely consistently. NormanGray (talk) 10:09, 8 August 2017 (UTC)