Yes, Ear (a) supports fast charging. After 10 minutes of charging, the earbuds can be used continuously for up to 3.2 hours with ANC OFF earbuds only (10 hours earbuds + case), or 2 hours with ANC ON earbuds only (6 hours earbuds + case).
The battery life data was tested in Nothing laboratories at a temperature of 25℃ with the earbuds and charging case fully charged, AAC music playback at 50% volume, and with other features at default settings. The actual result may differ based on device settings, environment, usage and other factors.