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

[MasteroftheVape]

Please stop the false fear threads for usb charging. A device can not draw more than the rated current from a charger unless the charger is mechanically defunct. 99% of problems people have is from using no name 50 cent chineese chargers that have little to no quality control and use substandard components. These chargers then fail internally through no fault of the device they are plugged in to.

A person comes along and sees a melted charger and his mod and thinks,"my apv killed my charger because the apv is warm too." The apv just did it's job to shed excessive current/voltage.

The same will happen in reverse,"my charger melted my apv because the charger is fine and my charging port is melted." This happens because the end device failed internally, the charger did nothing wrong.

Computers generally output 500ma for usb2, and 1.5 for 3. 3.1 standards is up to 2.1 or 2.4(don't remember offhand). These numbers are what the charger can give, not what it will give. Chargers charge at a higher rate by shorting pins internally, signaling the end device it is a charger and it can draw more current, but it can never draw more than the charger is willing to supply unless the charger has an internal failure.

Please stop misinforming the ecf community with bogus information. If people want to go on a charger crusade then spread the word to use quality chargers and aleviate 99% of issues, not use what you get at the dollar store, gas stations, or cheapo imports. (Quality imports are fine)

 

[Robert Cromwell]

I have been speaking of devices/APV's that have built in charging circuits and USE power from a USB adapter or port to power that charging circuit in the APV.
If a device charging circuit using a USB power source demands more current than the USB port can provide then the voltage input to the device demanding the current can drop. Simple ohms law. SOME charging circuits IN some APV's will be adversely affected by the lower input voltage and fail. The failure can exhibit itself in several ways. One way is for components in the charging circuit to overheat and short internally, possibly causing more shorts and possible meltdown/fire hazards.
This is electronics pure and simple. This is a fact of electronics and can become a safety issue. I am a CET and have most of my lifetime of experience in electronics. I am not a fear monger. If some decide to avoid my advise they do at their own peril I accept no responsibility for the actions of those who refuse to listen.

 

[Thrasher]

Yes, except no ones reporting this epidemic but you.

Remind me to never let you near my stuff with a soldering iron

As for being a CET?


Do you know what they call the person with the lowest passing grade in medical school? - Doctor

 

[Robert Cromwell]

Why would I even come around your stuff?

The lowest passing grade is still better than those who did not attend.

 

[MasteroftheVape]

Actually, I am medical and know more than one doctor I wouldn't let work on me... I also know that describing internal faults of "some" APVs as a blanket statement is irresponsible on a forum like this. It is skewed logic and misinformation without specific basis. Usb is standardized, if you find an apv that does not fit this description, and is not to spec, start a thread stating that.

Speak to your audience, not everyone on here is a cet or biomed engineer, most have little to no knowledge with electrical systems. Using a blanket statement is fear mongering to the uninformed end user.

Yes, under/over current and voltage can dammage electroncs.
Usb is made so everything is cross compatable and these differences are made compatable with each other via internal circuitry. If there is an exception to this rule found, then by all means share the info.

 

[Underwhelmed]

Threads like this help me find people to add to my Ignore List.

So thanks to the OP, but no further replies are needed(I won't see them.)