GTrusted
Plugging in the 29W USB-C Power Adapter to the Apple iPad Pro using the Apple USB-C to Lightning Cable, we determine how quickly the 29W charger fills up the iPad Pro's battery from 1% charge level.
Looking at the USB Power Delivery negotiations, a hard reset is first seen to occur before the Apple 29W USB-C Power Adapter starts to declare its power profiles of 12 watts (5 volts @ 2.4 amps) and 29.6 watts (14.8 volts @ 2 amps) to the Apple iPad Pro.
The Apple iPad Pro then requests 12 watts (5 volts @ 2.4 amps) to be provided by the 29W charger.
Eventually, we see that the Apple iPad Pro requests 29.6 watts (14.8 volts @ 2 amps) and gets accepted by the Apple 29W USB-C Power Adapter.
We also observe that the Apple iPad Pro starts charging at 29.6 watts (14.8 volts @ 2 amps) when the iPad's charge level is at 1%. Charging then slowly drops to around 20.7 watts (14.8 volts @ 1.4 amps) when reaching 1 hour and 32 minutes.
After 1 hour and 54 minutes, we can see that charging again drops to around 10 watts (5 volts @ 2 amps). It then further goes down to 2.6 watts (5.2 volts @ 0.5 amps) over a duration of 2 hours and 35 minutes.
The current pulled eventually settles at 0.5 amps as the battery is almost full. Overall it takes a total charging time of nearly 2 hours and 38 minutes for the Apple iPad Pro to get fully charged.
