Model S testing:

https://www.youtube.com/watch?v=t7xKWGzLjlo

Battery % ** 0-60mph * kW
***** 10% ** 3.90s *** 329kW (no Launch Control, no ludicrous plus, no max battery power)
***** 24% ** 2.89s *** 485kW
***** 50% ** 2.70s *** 527kW
***** 76% ** 2.53s *** 559kW
***** 99% ** 2.50s *** 576kW (wheelspin)