I'll have to measure it, will try with a fast charger and see how that goes. I checked my iPhone Xr yesterday, it records for 11 1/2 hours (24/96 CAF) with screen dimmed in airplane mode. The battery registers 92% of new capacity (bought two years ago but not much used during Covid music hiatus). But my old iPhone 6s, which the Xr was bought to replace, registers 90%, although its recording life is half what it was when new. So I'm not sure that reported metric is at all useful.