The Youtube channel Max Tech did some testing of various charging scenarios, Qi charging, Magsafe and lightning charging with 5.0, 7.5, and 20 watt power adapters.
His conclusions:
1. Lightning charging is the fastest, followed by Magsafe, then Qi
2. Charging rates as judged by power draw start high, but usually start dropping in the 70-80% charge range.
3. Full charges took from 1:45 minutes to over 3:15.
4. There is no reason to get the 20 watt power adapter if you have the 18. The 20 watt adapter never charges at more that 18 watts.
His conclusions:
1. Lightning charging is the fastest, followed by Magsafe, then Qi
2. Charging rates as judged by power draw start high, but usually start dropping in the 70-80% charge range.
3. Full charges took from 1:45 minutes to over 3:15.
4. There is no reason to get the 20 watt power adapter if you have the 18. The 20 watt adapter never charges at more that 18 watts.
