Tesla Model S Owner's Manual page 142

Subsystems
Battery - High Voltage
Type
Rating
Voltage and Polarity
Temperature Range
142
Liquid-cooled lithium ion (Li-ion)
60 or 85 kWh (at beginning of life)
366V DC negative (-) ground
Do not expose Model S to ambient
temperatures above 140° F (60° C) or
below -22° F (-30° C) for more than 24
hours at a time.
Model S Owner's Manual