The matter emerged about two years ago after some reports, and relative bad publicity, on old Tesla models that had caught fire. A not-so-uncommon problem in electric cars, looking at the chaos the Chevrolet Bolt went through recently. But in the case of the Model S and X affected by possible fires, the parent company chose to activate an update without notifying users about all the changes made. The latter significantly limited the charge of the batteries by cutting the total autonomy of the cars. Not only that: it caused (despite the lower amount of energy needed) an increase in recharge times at the Superchargers.
To worsen the situation, and to cause the start of the class action, there was the attitude not really transparent to users who complained of such problems. Tesla in fact denied any "deterioration" of the batteries and defined the upgrade as a necessary step to increase their duration. Not offering any alternatives, as it could have been to uninstall the latest update. Only later, after the initiation of the lawsuit, did it restore the battery capacity as it was before the updates dated 2019.
According to the latest documents filed in the San Francisco court, in addition to the reimbursements Tesla will have to maintain a constant communication service about the batteries. This includes the timely reporting of any interventions, possible changes to the management software and so on. Basically, everything he should have done before the discord update came.