valem wrote:the car has the transferable Gold Warranty until 2020, and would the new battery have a 5 year capacity replacement warranty still? If so that would be good to 2022.
The car has a typical bumper-to-bumper warranty against defects, etc.; then it also has a separate battery capacity warranty for 5 years. The Gold Warranty is to extend the factory bumper-to-bumper warranty to 8 years. That should cover the battery against defect for 8 years, but may not extend the separate _capacity_ warranty at all. Unless you read the terms of the Gold Warranty, you can only guess.
When a part is replaced under warranty, the original car warranty continues. So if you are 3 years into a 5 year warranty, and the manufacturer replaces the product under warranty, then the original car warranty continues for 2 more years. You don't get a brand-new 5-year warranty on the replaced part. The warranty is for 5 years on the whole car. Once the car warranty is over, no part of the car is under warranty, even if it was replaced 6 months before the end of the warranty.