For those wondering why their Istick or other USB charged device is melting the charging port.

[Completely Average]

the data rate has nothing to do with the charging it is just in the cut and paste I did from the attached link.

But your attached link was entirely about data transfer, NOT about battery charging.

See the link I posted earlier. BC1.2 specifications have been in place since 2010. 1.5A battery charging is the USB 2.0 and USB 3.0 industry standard. ANY USB device manufactured since 2010 that conforms to the industry standards will have 1.5A battery charging capability. It is the wiring in the USB port on the receiving end that limits the charge rate.

If you've got a charger that puts out less than 1.5A then it's either a USB 1.0 charger or does not conform to USB standards.

 

[jseah]

But your attached link was entirely about data transfer, NOT about battery charging.

See the link I posted earlier. BC1.2 specifications have been in place since 2010. 1.5A battery charging is the USB 2.0 and USB 3.0 industry standard. ANY USB device manufactured since 2010 that conforms to the industry standards will have 1.5A battery charging capability. It is the wiring in the USB port on the receiving end that limits the charge rate.

If you've got a charger that puts out less than 1.5A then it's either a USB 1.0 charger or does not conform to USB standards.

So you're saying that the USB port on your computer puts out 1.5 amps? I always thought that the USB port on computers only puts out 0.5 amp and that was the standard?

 

[Completely Average]

yes IF it is a CDP.

I'm certain you have no idea what you're talking about.

The CDP is on the device being charged, NOT THE CHARGER.

And many small AC adapters are for 500 ma max.

USB 1.0 or does not conform to USB standards.

Draw too much and the voltage drop can cause an overheat and failure in the charging circuit in the device or in the adapter or both.

It's impossible to draw more current from a 500mAh charger than 500mAh. They have internal circuitry that prevents it from happening. If they didn't then they would be 20A chargers drawing direct current from the wall socket. Plugging in a device that wants more than 500mAh won't do anything but charge slower.

 

[Completely Average]

So you're saying that the USB port on your computer puts out 1.5 amps? I always thought that the USB port on computers only puts out 0.5 amp and that was the standard?

1.5A for battery charging.

.5A for devices.

The wiring on the USB port on the connecting device defines the current that is being drawn.


Here, read this:

https://www.pericom.com/support/technical-articles/how-usb-charges-just-about-any-electronic-device/

If you want really technical, go here.

http://pdfserv.maximintegrated.com/en/an/AN4803.pdf

Skip to Page 4 if you want the short and sweet of it.

 

[rolygate]

We used to see loads of anguished cries that PCs and especially laptops had blown up when an ecig was plugged in a USB port. Sometimes the USB card was a daughter board or satellite board on the PC, not integral on the mainboard, so it could be replaced. But laptops that blew a USB port often had to be scrapped, and that's expensive.

Seems like that situation has more or less gone now, USB ports can handle half an amp, even on laptops.

Remember when we had to turn off a laptop or PC every single time you wanted to plug in or unplug anything, then reboot? Unplug a LAN or serial plug or parallel printer plug and bang! PC gone. Same if you hot plugged it - even if it didn't blow then it wasn't recognised, so you had to reboot anyway. Ah, the good old days...

 

[KattMamma]

I remember those days rolygate! And you forgot ps/2 devices - I saw many ps/2 ports get fried because people plugged or unplugged a device without shutting down.

About the USB ports - many (most?) computers are limited in the power available to the USB ports. I've seen desktops with 6 USB ports, and someone asks me why one or more of their USB devices won't work -- all 6 ports have something plugged in and the power supply can't keep up.

 

[crxess]

Nothing strange about your Dell laptop. Dell doesn't and never has conformed to industry standards and trying to charge a battery from a battery isn't exactly ideal in the first place. Take the battery out of your laptop then plug your laptop into the wall and see what happens.

?
Never said anything about Charging a battery from a battery. Units are on wall power. Been building laptops for 15yrs. PSU's are defective and Laptops pay the price.

Reading back:
People are getting confusing in the thread. Some talking about vaping passthru, others about charging.
Charging at .5a is NOT unsafe. If a unit normally charges at .8a then .5a will be a slow charge and 1a a quicker charge.
In this case 1.a will raise the internal temp faster and should be removed as soon a full charge is reached.

Passthru is not the same animal. The unit is attempting to multitask and if not designed specifically to do so problems can arise.

Another consideration is:
Micro charge port and Micro USB charging can be 2 different things entirely.
If a unit states Micro USB charging it should be meeting USB 2.ob or above standards.
*If a unit simply implies Micro port charging it may be using a micro usb a/b plug on a proprietary board with a proprietary charging design.

Assumption is often the Enemy

 

[skoony]

yes IF it is a CDP. And many small AC adapters are for 500 ma max. Draw too much and the voltage drop can cause an overheat and failure in the charging circuit in the device or in the adapter or both.

first you determine the maximum out put of the usb port whether wall
mounted or not.the port will not deliver more than that output. its
regulated not to do so but it will happily out put current at its maximum
rate. if the load does not require the maximum current out put it will
deliver a lower current.current draw is determined by the load.
if the device plugged into the usb port requires more current than
the port is regulated at one of two things will happen.
the device wont turn on.hence no current or the device
will operate a a reduced capacity.
as for the batteries most batteries by design can handle
a higher charging current than what is delivered by the
standard charger that accompanies them.
in the case of using usb ports for operating or charging a device
the original spec was 500 ma so most devices are designed of that
spec.now as the spec goes up increasing the amount of current
available devices will be designed that can utilize the additional power.
the old devices will work fine. as for so called super charging its
just semantics as the batteries are already spec'ed to handle
that much current.they just charge faster. its similar to a bass boost
button on audio equipment,its not boosting the bass. it stops filtering
out the bass that was already there.

regards
mike

 

[skoony]

the data rate has nothing to do with the charging it is just in the cut and paste I did from the attached link. My point is that some devices with built in USB chargers want more than 500 ma. This can cause excessive voltage drop in the input voltage to the device's built in charger and cause overheating or failure of that charging circuitry. If you device requires 500 ma or less certainly a 500 ma charger would be fine. Although I prefer some headroom on the current for longer life of the device involved.

there is no voltage drop. 5 volts at 500 ma amp max means
that it will remain at 5 volts 500 ma max and no more.
if the device you plug in needs more than that it either
not turn on or run at a reduced capacity using what
it is given.
mike

 

[skoony]

But your attached link was entirely about data transfer, NOT about battery charging.

See the link I posted earlier. BC1.2 specifications have been in place since 2010. 1.5A battery charging is the USB 2.0 and USB 3.0 industry standard. ANY USB device manufactured since 2010 that conforms to the industry standards will have 1.5A battery charging capability. It is the wiring in the USB port on the receiving end that limits the charge rate.

If you've got a charger that puts out less than 1.5A then it's either a USB 1.0 charger or does not conform to USB standards.

usb 2- 500 ma available for usb powered devices
usb 3.0- 900 ma available.
http://www.diffen.com/difference/USB_2.0_vs_USB_3.0
mike

 

[gpjoe]

What exactly is melting?...the USB port on the PC or the micro USB on the vaping device? None of mine are melting, but I use wall-warts 100% of the time.

 

[WickedBad]

usb 2- 500 ma available for usb powered devices
usb 3.0- 900 ma available.
USB 2.0 vs USB 3.0 - Difference and Comparison | Diffen
mike

You are looking at the wrong thing. That shows what it puts out to a regular device. USB Has different ratings for charging. (1.5a) So if you plug in a thumb drive it gets 500ma but if you plug in something to charge then it can pull up to but not past 1.5a. If you put a 2a charge item on it will charge just fine at 1.5a (but slower) and if you put a 1a charge item on it will charge at 1a not 1.5a

 

[four2109]

I bought a 6 port smart multi port usb charger and I'm, just going to take my chances. It's insane to think the average consumer could keep up with this. I couldn't even find the output on the 4 usb ports on my laptop, though I think they vary.

 

[Robert Cromwell]

You are looking at the wrong thing. That shows what it puts out to a regular device. USB Has different ratings for charging. (1.5a) So if you plug in a thumb drive it gets 500ma but if you plug in something to charge then it can pull up to but not past 1.5a. If you put a 2a charge item on it will charge just fine at 1.5a (but slower) and if you put a 1a charge item on it will charge at 1a not 1.5a

Not ALL USB ports will act this way many will but not all will and some people use a cell phone charger with dedicated wire since it will put out 5 volts and fit in the micro USB port on the device. But many of those cell phone charger are only rated for 500 ma since that WAS the maximum USB current allowed and still is in some devices.

 

[Robert Cromwell]

I bought a 6 port smart multi port usb charger and I'm, just going to take my chances. It's insane to think the average consumer could keep up with this. I couldn't even find the output on the 4 usb ports on my laptop, though I think they vary.

but a seperate 2 amp cube adapter for it and be sure.
I use a 2 amp cube wall adapter and feed a USB hub off of that.

 

[four2109]

but a seperate 2 amp cube adapter for it and be sure.
I use a 2 amp cube wall adapter and feed a USB hub off of that.

It's 10 amp max. It's a multi charge, rather than a hub.

 

[Dampmaskin]

I wrote a guide of sorts about this some time ago. Choosing the right USB charger for your mod

 

[Thrasher]

Unless you use a 5 year old flip phone no modern phone or tablet comes with a .5 amp adaptor.
Standard charge for 3 or 4 years now has been 2.1 amps.

 

[four2109]

I miss my flip phone.

 

[beckdg]

there is no voltage drop. 5 volts at 500 ma amp max means
that it will remain at 5 volts 500 ma max and no more.
if the device you plug in needs more than that it either
not turn on or run at a reduced capacity using what
it is given.
mike

When you over draw any power supply, bus lines or wires, the result is the voltage supplied at the termination end is choked.

Tapatyped