You can now monitor a piece of data you have no means whatsoever to adress outside of the tesla ecosystem. which is thrice fold not an issue with "open-er source" ICU vehicles because: 1. no concern for this battery (obvious I guess) 2. you can bring it to the mechanic down the street, 3. You can do it yourself with parts you source with a warranty that the dealer does not care about.

If your battery "starts to go", do you think you can go anywhere besides Tesla, and that they will not first charge you for a diagnostic using their license ODB2 software? Your diagnostic using a non licensed odb2 scanner and....android app will not allow them to bypass the diagnostic you will certainly have to have done by them, because of their insurance/warranty process requiring licensed equipment. ICU manufacturers DO pull the same shit, but you can at least bring the car to a cheaper mechanic who is hopefully footing the bill of the tooling/license.

Say you ARE Able to perform work outside of Tesla, better not tell Tesla that, or your vehicle will be blacklisted.