Supplier: German Accumotive GmbH & Co. KG
Designation: E18-1
Continuous power: 42kW
Peak power: 63kW
Energy content: 17.6kWh
Rated voltage: 400V
Weight: 175kg
The battery pack can be cooled and also heated via a fluid based thermal management. It consists of 3 modules each with 31 cells and thus has a total of 93 cells. When discharged, it has a total voltage of about 310V and fully charged at a total voltage of about 390V.
You can also read out the battery of your smarts yourself and here's pictures and explanations of the open battery.