iPad Pro Strange behavior while charging the IPhone via iPad Pro

[Kaikidan]

today my phone was low on battery and I still needed it for the rest of the day, I had no power outlet available, so I tested using the iPad Pro 11 as a power bank as I had saw that it’s possible.

I connected my iPhone SE with the original cable on a usb 3.0 to usb C dongle and connected it on the iPad. After just 5min the iPhone battery had gone up at least 7%!!! I trough that this was weird and disconnected, I was afraid that somehow the iPhone was drawing too much power from the iPad and that it could potentially damage the USB port on the iPad.

Is that normal behavior or was I right in suspending the connection after noticing this?

 

[chabig]

Let’s see...you plugged your iPhone into an iPad acting as a power bank. It worked. And you wonder if it worked normally?

Yes. That’s the correct behavior. Your devices manage their power. They won’t be damaged.

 

[Kaikidan]

Let’s see...you plugged your iPhone into an iPad acting as a power bank. It worked. And you wonder if it worked normally?

Yes. That’s the correct behavior.

But it normally charges in 2h, it seemed like fast charging to me by the rate it was going, normally on the wall brick it charges like 1% at every 2-3min, not 7% in just 5min. I was afraid that something was amiss and that I could damage either the iPhone battery or worst, the iPad itself.

 

[Shirasaki]

No need to be paranoid here. Both iPad and iPhone are “smart” enough to not kill themselves by charging iPhone using iPad. Plus, isn’t quickly going from 2% to 7% a good thing? Most fast charging technologies work great especially when battery is low.

 

[EugW]

The adapter that comes with your iPhone supports up to 5 Watts maximum.
The iPad Pro can output 7.5 Watts maximum.

I believe the iPhone can charge with up to 18 Watts maximum. In fact, Apple sells an 18 Watt fast charger for iPhones. Too bad they don't include that in the box, and instead only give us the 5 Watt adapter.

 

[AutomaticApple]

today my phone was low on battery and I still needed it for the rest of the day, I had no power outlet available, so I tested using the iPad Pro 11 as a power bank as I had saw that it’s possible.

I connected my iPhone SE with the original cable on a usb 3.0 to usb C dongle and connected it on the iPad. After just 5min the iPhone battery had gone up at least 7%!!! I trough that this was weird and disconnected, I was afraid that somehow the iPhone was drawing too much power from the iPad and that it could potentially damage the USB port on the iPad.

Is that normal behavior or was I right in suspending the connection after noticing this?

What is there to be worried about?

 

[joeblow7777]

But it normally charges in 2h, it seemed like fast charging to me by the rate it was going, normally on the wall brick it charges like 1% at every 2-3min, not 7% in just 5min. I was afraid that something was amiss and that I could damage either the iPhone battery or worst, the iPad itself.

Devices tend to charge faster while they are near empty and then trickle to a slower rate as they get closer to being full.