It is a consumer term/ name. (or scam name ?)

The actual electrical name is the wire resistance.

The apple cable charging is just some resistor to activate the charging. Normal cable won't charge.

You want to derail the thread ?

I modify before la.

Just get 2pcs different reading resistor solder it to the wire. And you can charge the apple device. Need diagram.

I don't understand what you mean different.

My modification is like this. I use solar to convert to 5V USB and thinking of charging all my gadget. But it won't charge the iphone or ipad even with the original cable.

So google around and find out that you need to solder some resistor into the USB port side. After modify, it work like charm.

Apple use higher voltage to compensate the long cable voltage drop. So when you use cheap cable, it drop further. (Impurity of the copper and the thin AWG)

Some battery can't take high amp to charge. It will shorten the life or hit up and fire. It have a formula to calculate. Depend on the phone designer. Otherwise it limited by the charger of amperage control.

I don't have the plug in amp usb checking. So I can't compare and tell the actual amp.

But I don't face any slow charging even using oem cable and adaptor. But my oem cable and adaptor is not cheap either.

That is normal when you want cheap china thing.

But I not agree " it's whether is real or original or not". There is no wrong if you get cheap oem cable but high resist. Because it is cheap. But not fake.

People said you pay peanut, you get monkey.

I know about wire resistance. So I don't simply get cheap thing.

Even the oem ipad cable I get is a Belkin. So I don't see any different charging time with the original cable.

I don't have the USB amp meter. So can't tell.

Maybe will try to get 1 and test compare.

You can't charge at higher voltage. If your phone require 5V, you going to burn down your phone if you input 9V.

Ampere is the different.

For your case, thickness cable is the problem. Measure in AWG or mm2.

Higher amp require thicker cable to carried.

I just read in detail.

It is not charging at 9v. It depend on the phone acceptable voltage.

The charger will handshake with the phone and settle at what voltage to accept. The phone processor (snapdragon have 5/9/12V ?). If your phone accept only 5v, than it charge at 5v with higher amp. Maximum of 18w.