I recently bought an M4 iPad Pro 11" and couldn’t find detailed charging data about it. Here are my measurements.
I wanted to know:
- What is the maximum charging speed?
- How high does it charge at maximum speed?
- How long to 60%? 80%? 100%?
I tested with an Anker Nano II 65w charger and my Plugable USB-C power meter.
I set the screen to never turn off so that I could see the exact battery level during charging. I used a black background and brightness was at about 30%. Wifi, Bluetooth, and Cellular were on with good signal strength.
I ran the iPad battery down until it turned off, and then recorded a video of it charging back up.
Here’s what I saw:
| 0% -> | Time | End Watts |
|---|---|---|
| 20% | 0:15 | 35w |
| 40% | 0:30 | 35w |
| 55% | 0:41 | 35w |
| 60% | 0:45 | 28w |
| 75% | 1:02 | 16w |
| 80% | 1:10 | 17w |
| 90% | 1:25 | 17w |
| 95% | 1:38 | 9w |
| 100% | 2:00 | - |
The iPad charges at a max of 35w, which it maintains from 0-55%. After 55%, it slows to ~25w until 70%, and then ~17w until 90%. I didn’t see the iPad draw more than 36w, even if I run a benchmark on it while the battery is under 50%. If you bring a 30w charger, you’re getting just about maximum speed.
Overall, charging from 0-60% is quick, taking only 45 minutes. Charging to 80% (1:10) or 90% (1:25) is still reasonably fast, but 90-100% is slower. If you turn on the 80% Limit, charging is relatively fast all the way until it stops.