ChargerLAB POWER-Z KM003C Tester
As we all know, the ChargerLAB POWER-Z KM003C is a feature-rich and highly professional testing instrument. It supports power testing, fast-charging protocol detection and triggering, ripple testing, PC software data logging, and PD protocol analysis. It can meet the needs of both everyday users and professional developers. Below are the results recorded by the KM003C via PC software when testing Apple’s latest 40W Dynamic Power Adapter under load.
Data Logging
After connecting the KM003C to a computer via HID, simply launch the PC software to start recording. We performed aging tests on Apple’s recommended 40W Dynamic Power Adapter for the iPhone 17 series at different power levels—40W (20V 2A), 48W (20V 2.4A), and 60W (20V 3A)—all without active cooling. Let’s take a look.
40W（20V 2A）
A one-hour stress test at 40W (20V 2A). The KM003C recorded full and stable output throughout, with no thermal protection triggered.
48W（20V 2.4A）
Next, a one-hour stress test at 48W (20V 2.4A). The KM003C measured continuous full-power output without thermal protection. However, this already reached the charger’s thermal dissipation limit—any further increase in output power or ambient temperature would cause power reduction.
60W（20V 3A）
Finally, a stress test at maximum 60W (20V 3A). The charger triggered thermal protection at the 22-minute mark, reducing output to a maximum of 40W. Once temperatures dropped, the output automatically ramped back up to 60W. The whole process was smooth without disconnection.
Summary of ChargerLAB
Overall, Apple’s new 40W Dynamic Power Adapter behaves differently at each power level. At 40W and 48W, it delivers stable output; at 60W, it does trigger thermal protection but demonstrates intelligent power adjustment. Due to time constraints, a more detailed teardown, in-depth review, and various iPhone 17-related videos will follow soon—stay tuned!