In a recent review, we have seen how charging happened over USB Power Delivery between the Huawei P10 phone and the Apple 87W USB-C Power Adapter (originally shipped with the Apple 15" MacBook Pro (Late 2016)) when the phone was 3% charged. Here we determine how long it takes for the Apple power adapter to fully charge the Huawei phone from a well depleted battery.
Similarly, we observe the USB Power Delivery communications using the GRL-USB-PD-A1 analyzer by Granite River Labs after connecting both charger and phone over the USB Type-C interface. As expected, the Apple 87W USB-C Power Adapter initially repeats its source capability of a single 12 watts (5 volts @ 2.4 amps) when the Huawei P10 is on a 0% battery charge. Having no response from the phone, a hard reset is triggered and the Apple charger again declares the same 12 watts power profile.
We can also see in between negotiations several Vendor Defined Messages take place which when completed, the Apple 87W USB-C Power Adapter finally offers its full power profiles of 27 watts (9 volts @ 3 amps) and 86 watts (20 volts @ 4.3 amps) on top of the initial 12 watts (5 volts @ 2.4 amps).
The Huawei P10 then decides to charge faster by requesting a higher 18 watts (9 volts @ 2 amps) power to also get accepted by the Apple charger. Subsequently, we also observe the charger initiates Discover Identity's and SVIDs' with the phone.
Upon initial plugin from zero charge, the phone first pulls current at 5 volts after negotiating 10 watts (5 volts @ 2 amps) during power off or sleep mode.
At the second 18 watts (9 volts @ 2 amps) request, the phone draws around 16.2 watts (9 volts @ 1.8 amps). After about 13 minutes of quick charging, the current pulled drops down to about 1.2 amps @ 9 volts when the phone is switched on. While the phone is being used, the current slowly decreases down to about 0.6 amps @ 9 volts in the first 62 minutes of charging.
For some reason, once the current reaches about 0.4 amps, it rises quickly to 1.3 amps but gradually goes down further to below 0.2 amps @ 9 volts.
In the next remaining hours, the phone pulls current under .1 amps @ 9 volts with frequent current spikes as the battery gets almost full.
The Huawei P10 takes nearly 2.5 hours to fully charge from a completely drained battery with the USB Power Delivery based Apple 87W USB-C Power Adapter, which is longer than about 126 minutes needed to charge with Huawei's proprietary Huawei SuperCharge charger (seen here). The Huawei P10 however didn't seem to use the higher power charging levels with its own SuperCharge technology to charge at just mostly around 15W.