Edited by MemberChuwi at 10-28-2017 06:42 |
Tried to check out the 'oxidation' theory.
Here you find a typical plug you can order at Conrad Electronics - and a related spec Sheet.
https://www.conrad.de/de/usb-c-s ... t-1-st-1395591.html
Contact material used is a copper alloy. Typical contact resistance is 40mOhms (=0,04 Ohms) new and 50mOhms (=0,05 Ohms) after some typical use. This is less than 1% compared to the discussed load resistance of 6 Ohms with Hi13 and therefore irrelevant. Even if wearing is assumed to be much higher, maybe 0,5 Ohms it's still less than 10% in the chain and still not a major problem.
Nominal voltage is 5V. So you could claim something to be out of spec. But that's just nominal. Insulation has been rated for 100V, so 12V isn't a severe issue imho. It does no harm or wear the contact additionally, especially if you plug in before you power the charger. This is what I prefer doing.
Temperature is speced up to 85℃. Usually you can't touch a surface for long that is 60+℃ . That's a pretty simple method to get an impression of temperature. If you can touch permanently it's below 60℃. Never experienced that limit with my Hi13.
What about contact power dissipation? It's approximately 160mW in typical case. Even a small resistor can dissipate this without heatsink. But we are talking copper contacts and metal wires that can transport and dissipate this bit of heating power for sure without any trouble.
Remains the current spec to be unclear. The mailorder claims 1.25A... not sure what that means. If it's per contact then we are in the 5A zone (4 contacts Vbus and Gnd each) which is more than enough for Hi13 needs.
All this data renders the heat/oxidation/wear theorie in real life to be very improbable. Guess high quality plugs have gold coated contacts, not just copper alloy, and will perform even better.
I can't find any point that speaks for the oxidation theory - except general aging. But that applies anyways, regardless if you use a device or not.