I have had my 12 V battery fail twice now. First one was done under warranty. Now, I'm not sure what they will do but I will update. Basically, this battery is required to drive the car. If it fails you are stranded. It relies on this battery to power all the electronics, so no software starts up if it is dead. I think this is a serious issue and at minimum should have user diagnostics on the battery to give you some idea of the true shape of the battery. As it stands it only gives you a yellow warning light. Given the frequency and severity of this issue I think more information for the driver is needed and all repairs should be done at no cost since the vehicle is brikced without it. This is a serious issue and I'm not sure how they could have designed this any better, but given the nature of this vehicle, this is an exceptional case that should always be repaired free barring any other option.