No, I don't think they will cover it under warranty. Subwoofer upgrade, though it's tied into the inverter, not directly to the battery. Never an error code. Never a drain. Technically should not be affecting the 12 volt at all.
I expected a little less life on the 12 volt, but not this much less. And as I said, had planned on Ohmu when it was time. I don't really care about the warranty, don't mind purchasing one, just wanted a better one.
I talked to the Tesla service advisor about the changed BMS settings, rendering Ohmu batteries non-functional. He confirmed that it was NOT a byproduct of another software update, but instead, a purposely executed plan to stop people from purchasing Ohmu batteries....lost revenue fur Tesla, obviously. This tells me that the Ohmu situation won't get solved, no matter how many signatures they get on their petition. He just smirked, and told me that the only way to get a LiOn 12-volt is to trade the car in for a newer model. There are no plans fur Tesla to offer one for older models. I told him thanks, but if I DID trade my Tesla, it wouldn't be for another Tesla.
So...looks like I'm purchasing another 12 volt battery from the Continental Tire Company. Sigh.
Oh, and if it IS a rebranded battery from Continental, can anyone tell me, with certainty, who makes it?