usb hub in mains charger?

[kingofswords]

i couldnt find right section to ask this....

i dont really know about volts and ohms.
if you have more than 1 usb charger for 510 battery is it ok to plug a (4 way) usb hub is the mains charger? would it take longer to charge then up?

[Gordy]

an educated guess - if the usb doesn't have its own power supply then yes the chargers would be sharing the power of the hub and slow their charge down

[monster74]

I know that any USB that share there power supply with a hub run at a slightly slower rate. So yes I'd imagine if you plugged a power supply in it'd be slightly less. Not noticeable on most computer aided stuff but I imagine it would be on an ecig.

[Perpetua]

Now I'm not completely sure on this ( being of the technically challenged persuasion ) but I do know with a Garry Dibley Pass Through you need a USB/Mains hub with a certain amperage ( ? ) for it to work properly.

Whether this applies to battery charging I don't know, I'm sure someone with more knowledge will clarify . . . but this is the one I use, that copes with a GD PT and battery charging, safely & successfully.

www.ebay.co.uk/itm/280522733324?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1438.l2649

[bioxx]

^ yours is with external power supply, that's a good thing.

Generally, every USB hub w/o external power supply is a resistor in itself. So less output than input. You might notice this of you plug a camera/ satnav that needs serious charging into the USB hub that it might disconnect from time to time. I'm not very fond of charging anything via USB port coz they sit directly on the main board and if that dies you are in for a lot of £££. But that's only IMHO. :-[

[blakey]

The usb output is 5v, if you use a hub and connect other devices then each device will share that 5v. The pass-through that I have needs 5v and its performance suffers when I connect other devices.

[grizwald56]

I use the one in Perpy's link myself and have had no problems with it at all, however as Blakey says the 5v output is shared if you plug anything else into it.

[bioxx]

^external power supply makes the difference. The output on those is (relatively) stable even when several consumers are plugged in.

[Perpetua]

Thanks for clarifying that gents . . . I'm no wiser really, as this gubbins is all double dutch to me . . . but I'm happy that wot I've got and use is ok.

[kingofswords]

lol i now what you mean perpy...im more confused now.
i thought the point was that there would be less resistance in the hub therefore allowing the voltage in each output be higher or s'thing.

bioxx i was gonna plug my usb hub into a mains charger ...isnt the output on these higher than a laptop usb?

[Gordy]

the mains USB 'can' supply a slightly better supply than from a PC... as PC usb ports should offer the standard 5v 500mA but can vari between models

here is a quick diag to show how a powered hub offers more power than a non powered hub

[bioxx]

Nov 10, 2011 23:12:18 GMT kingofswords said:

bioxx i was gonna plug my usb hub into a mains charger ...isnt the output on these higher than a laptop usb?

Gordy's pic explains it perfectly. USB hubs can run on USB power but can also have an external power supply.

Very similar to external hard drives. I use Seagate Free Agent Go<- only USB but there are others which have an external power supply. Difference here is in the price, the ext. power ones are much cheaper.

[kingofswords]

ah ok but if im using 190Mah batteries and the usb output is 500Mah then if i have 2 batteries charging via usb hub then surely that would be 250Mah each so that wouldnt slow things down?

doesnt the usb thing that has battery screwed in have a resistance of some kind?

[Perpetua]

I feel quite sick at the very mention of all that King . . . I'm sure the ' Knowledgeable Ones ' will have an answer for you, I'm just cluttering up your thread as I don't want you to think that you're being ignored.

[Gordy]

mA and mAh are different King

mA = milliAmps = charger or usb port gives out
mAh = milliAmps per hour = what the battery outputs and not what is required as an input from the charger

connections do have a resistance in fact everything will have a resistance even the wire in the cable