Well, failure or not, the CT is a technological tour-de-force.  
I just found out that the CT's low voltage system (the one that runs the lights, window motors, radio, etc.) is 48V, and uses a tiny 4Ah lithium battery.  It may be the only EV with a 48V aux. system.
Note that other EVs and hybrids have a 12V low voltage system, and conventional auxiliary components.  Most EVs and hybrids today even use a separate 12V lead-acid battery.  Some, since about 2021, have gone to a lithium 12V battery, while non-CT Teslas have gone to a 16V li-ion.
My own '21 Hyundai HEV uses a lithium 12V battery that is inside the main battery casing, and separately replaceable.  It is cooled by the main air cooling system and covered by the 10y warranty.