The Lotus had a LCD screen with BMS info. There was a lot of info on cell level about temperture and voltage level. The Tesla Model S doesn’t inform the driver with any information about the battery other than de SOC (state of charge). To get to this information you have to access the CAN-bus and read the CAN messages. To do so you need to find the diagnostic connector which is behind the shelf just beneath the main screen.
Tesla uses a proprietary connector instead of the standard OBD-II connector. Most diagnostic interfaces come with the OBD-II connector so an adapter cable is needed.
To see the CAN-bus info you need software that is capable of translating the Tesla CAN messages. You can use Scan My Tesla for Android or TM-Spy for Apple. Since I have an Android Phone I went for Scan My Tesla and bought a OBDLink MX ABD-II adapter.