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u/Deulofeu10

r/ChargingSheet
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Ugreen Magflow Qi2.2 25W pad test

Warning: here be AI slop :) Was curious to measure performance of my magflow qi2.2 25W using my alientek c2 pro. Additionally, wanted to see how much Claude Fable could help.

Pretty html screenshot here: https://i.nuuls.com/hKjOo.png

Setup: iPhone 16 (94% battery health) · UGREEN MagFlow 2-in-1 Magnetic Wireless Charger (Model W752, Qi2.2 25W) · UGREEN Nexode 100W 4-port (Model CD226) · ALIENTEK ATK-C2 Pro USB tester inline between adapter and pad, logging at 20 SPS · 75 °F (23.9 C) ambient with light airflow.

Results (2% → 81% in 53.6 min):

Metric Value
Peak input (1 s avg) 25.8 W
Est. received at phone ~20–22 W
Average input on-pad 15.7 W
Energy drawn (DC into pad) 13.82 Wh
Est. end-to-end efficiency ~74%
PD contract fixed 15 V / 3 A throughout

Notable findings:

  • The initial handshake parked at a flat 17.3 W (15 V × 1.15 A) for the first 12 minutes. An accidental lift-and-reseat forced a renegotiation that unlocked the full Qi2.2 25W rate — peak 25.8 W about 2 minutes later. If your run flatlines around 17 W, try re-seating the phone.
  • Power above 20 W was only sustained for 6.1 minutes of the whole run; the bulk phase sat at 15–20 W (29 min), then stepped down ~17 → ~13 → 8 W by the 81% cutoff.
  • The pad regulates purely by modulating current — the 15 V PD contract never changed.
  • Time per input-power band: >20 W: 6.1 min · 15–20 W: 29.0 min · 10–15 W: 11.9 min · 5–10 W: 5.1 min.

Method & caveats: all watts are DC into the pad, so they include pad electronics + coil link + the phone's charging losses, but exclude the wall adapter's own AC→DC loss (typically another ~8–12%). Efficiency = est. 10.2 Wh into the battery (13.78 Wh design × 94% health × 79-point gain) ÷ 13.82 Wh measured in. Phone-side watts are estimated from a typical 75–85% MagSafe-class link, which reconciles the Qi2.2 25W profile rating with the ~22 W that phone-side tests report.

iPhone 16 (94% health) | UGREEN MagFlow 2-in-1 (Model W752, Qi2.2 25W) | UGREEN Nexode 100W (Model CD226) | PD fix 15V/3A | 2→81% | 53.6 min | peak in 25.8 W | avg 15.7 W | 13.82 Wh DC-in | ~74% eff (DC-in→battery, est.) | 75°F, light airflow

u/Deulofeu10 — 1 month ago