- Connecting
- Need
- Answer
Fast-charging an iPhone with Lightning
Get this
USB-C to Lightning cable (MFi-certified), with a USB PD charger of 20 W or more
Look for
- Made for iPhone (MFi) on the box
Avoid
- USB-A to Lightning cables: about 12 W at most
The power arithmetic
| Volts × amps | Watts | Cable needed |
|---|---|---|
| 9 V × 2.22 A | 20 W | Any USB-C to USB-C cable |
Standards behind this answer
2012
Lightning
Apple's reversible 8-pin connector, 2012–2023. USB 2.0 speed on almost every device.
- data: 480 Mbps (USB 2.0)
- video: via adapter only
- power: about 20–27 W with USB PD
USB Power Delivery (60 W, 100 W, 240 W)
The charger and device agree a voltage; the cable decides whether 3 A or 5 A is safe.
- power: 60 W / 100 W / 240 W