Key Takeaways
1. The iPhone 17 charges at different speeds depending on the power adapter used, with the 20 W adapter being the slowest.
2. The 40 W, 70 W, and 140 W adapters all peaked at around 36 W and showed similar charging performance.
3. Charging times to reach 50%, 80%, and full charge were consistent across the 40 W, 70 W, and 140 W adapters, averaging around 18-19 minutes, 42-44 minutes, and 1 hour and 41-42 minutes, respectively.
4. The 20 W adapter took significantly longer to charge the iPhone 17, reaching 50% in 27 minutes and full charge in 1 hour and 50 minutes.
5. ChargerLAB concluded that the new 40 W charger does not offer significant advantages for the iPhone 17, which still uses the standard USB-C PD protocol.
ChargerLAB recently conducted tests to see how the iPhone 17 performs with four different USB-C power adapters from Apple: 20 W, 40 W, 70 W, and 140 W. The tests were carried out using a POWER-Z KM003C tester and POWER-Z Lab V2.4 software, all within a thermotank set at 25 °C (77 °F).
20 W Adapter Performance
With the 20 W adapter, the iPhone 17 started with a 9 V output and consumed 19 W for the first 36 minutes. After that, the power usage dropped to 12 W, and then to 7 W around the 65-minute mark, entering a trickle-charging stage thereafter. It took 27 minutes to reach 50%, 52 minutes for 80%, and a total of 1 hour and 50 minutes for a full charge.
40 W and 70 W Adapter Results
Using the 40 W adapter, the iPhone 17 generated a 15 V output and peaked at 36 W. The power level remained approximately 28 W for the initial 11 minutes, gradually decreasing in a stepwise manner to about 8 W by the 57-minute mark, and finally dropping to 5 V as it neared the end. The times to reach 50%, 80%, and full charge were 19 minutes, 44 minutes, and about 1 hour and 42 minutes, respectively.
The 70 W adapter showed nearly identical results, also triggering a 15 V output with a peak of 36.7 W. It maintained 28 W for 13 minutes before gradually falling to 24 W, 19 W, 12 W, and ending at 7 W by the 57-minute point. The charging times for this adapter were the same as the 40 W, reaching 50% in 19 minutes, 80% in 44 minutes, and a complete charge in 1 hour and 42 minutes.
140 W Adapter Similarity
The test with the 140 W adapter yielded a nearly identical charging curve, peaking around 36 W and reaching 50% in 18 minutes, 80% in 42 minutes, and finishing in 1 hour and 41 minutes.
When these results are compared, the charging curves for the 40 W, 70 W, and 140 W adapters look nearly the same. The iPhone 17 achieved 50% in 19 minutes, 70% in 30 minutes, 80% in 41 minutes, and a full charge in about 1 hour and 39 minutes.
In contrast, the 20 W adapter showed a noticeably slower charging rate. The 70 W adapter was only slightly faster than the others, with the differences being minimal. ChargerLAB concluded that Apple’s new 40 W charger with the SPR AVS protocol does not provide any significant benefits for the iPhone 17, which continues to utilize the standard USB-C PD protocol.
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