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Power Vs KWh

Sorry if this is a noob question but I was wondering what is the long term impact of the battery life on my car's performance specs.

Say if I lose 30% battery capacity after 6 years and 120,000 miles and my 85D becomes a 60D, does it also mean that my 0-60 in 4.2s becomes to 0-60 in 5s or more? I don't believe that'll happen but just wanted to be sure.
Regarding kW (power) versus kWh (energy) of MS, I think there would be some correlation between health of battery versus the motor kW output. This is gleaned from the P85D performance being battery SoC dependent. Non-performance MS is less limited by battery SoC for motor kW output, therefore I would not worry too much. I also hope you don't lose 30% battery capacity after 6 years and 120,000 miles.
Apparently the battery is still 400 V, but the voltage sag under high load is greater as a result of internal resistance increases in the cells. This equals less peak power. My car has seen 3 85 kWh packs over its lifetime. I can tell you that the peak power output varied pack to pack.