The fast charging capability has become an important factor in the calculus of consumers' decision-making when it comes to shopping for a charger. We recently got our hands on a new Google Pixel 3. Without attempting to guess at what Google meant by the term "Charging rapidly," which is shown on the phone's lock screen, we collected some raw data on the state parameters when the term was displayed on the lock screen.
Parameters when "Charging rapidly" was displayed on Pixel 3's lock screen:
| Name and Model of Charger | Battery Level of Pixel 3 | Voltage | Current |
| ZMI PowerPack 20k (over USB-C to USB-C cord) Model QB820 | 65% | 8.87V | 1.24A |
| Google 18W AC adapter Model G1000-US | 69% | 8.89V | 1.10A |
| Apple 29W AC adapter Model A1540 | 71% | 4.89V | 1.37A |
| Apple 29W AC adapter Model A1540 | 72% | 4.75V | 1.96A |
| ZMI Turbo 45W AC adapter Model AD03Z | 77% | 8.92V | 0.83A |
| Apple 29W AC adapter Model A1540 | 79% | 4.87V | 1.40A |
| Google 15W AC adapter Model GL0102 | 85% | 4.96V | 1.50A |
| Google wireless charger Model G019C powered by Google 18W AC adapter Model G1000-US | 67% | 9.07V* | 1.36A* |
| Google wireless charger Model G019C powered by Google 15W AC adapter Model GL0102 | 21% | N/A | N/A |
| Google wireless charger Model G019C powered by ZMI Turbo 45W AC adapter Model AD03Z | 34% | 9.13V* | 1.35A* |
| ZMI PowerPack 10k (over USB-C to USB-A cord) Model QB810 | 88% | 5.13V | 1.56A |
| ZMI 18W AC adapter Model HA612 (QC 3.0, USB-A port) | 84% | 5.21V | 1.34A |
| ZMI PowerPack Ambi | 4% | 8.98V | 1.60A |
* Measured at the AC adapter's USB-C output port.
Parameters when "Charging" was displayed on Pixel 3's lock screen:
| Name and Model of Charger | Battery Level of Pixel 3 | Voltage | Current |
| ZMI PowerPack 20k (over USB-C to USB-A cord) Model QB820 | 67% | 4.91V | 1.48A |
| Apple 5W AC adapter Model A1385 | 73% | 4.92V | 1.16A |
| Samsung 15W travel adapter Model EP-TA20JWE |
73% 84% |
4.99V 5.13V |
1.49A 1.37A |
| MacBook 12" 2017 USB-C port | 73% | 4.64V | 1.47A |
| ZMI PowerPack 10k (over USB-C to USB-A cord) Model QB810 | 92% | 5.19V | 0.84A |
Parameters when "Charging slowly" was displayed on Pixel 3's lock screen:
| Name and Model of Charger | Battery Level of Pixel 3 | Voltage | Current |
| HP Envy x360 13t 2017 USB-C port | 73% | 4.86V | 0.5A |
Method & Materials
- A Satechi USB-C voltage/current meter dongle (Model ST-TCPM) was used.
- A brand-new Pixel 3 (Android version 9)
- Power bank, AC adapters, and laptops as indicated in the tables above