I would have thought that this should be covered by the 8-year 100K battery warranty on the replacement battery. The relay is part of the battery pack.Warning light came on re this component. Dealer tech got codes P0AA1 & P1E00 for 'battery relay due to stuck controller'; addressed in bulletin 21-NA-288.
Year 2017 car at 106K miles, so $1550 cost for replacement not covered. Labor est. at 6.5 hours.
Anyone else have this defect happen? 'software anomaly' listed as possible cause, which if definitive, should not be owner cost for repair. But at this mileage will probably need to accept the resolution.