Fast charging is a set of technologies that supply more than the basic 5 W of power to a device so its battery fills faster. The charger and device negotiate a higher voltage or current, using standards such as USB Power Delivery.
Why it matters
A fast charger can bring a phone to about half charge in around 30 minutes, depending on the model. Charging slows as the battery nears full to protect it.
The charger, cable and device must all support the same protocol. Otherwise the connection falls back to a slower speed.
Example
Power (W) = Voltage (V) x Current (A)
5 V x 1 A = 5 W
9 V x 3 A = 27 W
20 V x 5 A = 100 WA 100 W charger delivers only what the phone requests, such as 27 W.
Common mistakes
- Using a low-quality cable that limits current.
- Assuming a higher-wattage charger will damage the phone. The device controls the draw.
- Using proprietary fast-charging protocols with a mismatched charger.
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