I have a 2024 HR-V, just 2 months old. I have had a dead battery a couple of times.
The first time was when I was washing the car and left it unlocked (not sure if it was in accessory mode). The next day I tried to start it and the battery was dead. The recovery man jump started it easily and advised leaving it on the driveway in ready mode for a couple of hours. The engine starts occasionally to keep the HV battery charged but the HV battery slow charges the 12V battery while in ready mode. This worked.
The dealer looked into it but said the battery tested OK.
A couple of weeks later I went on holiday and left the car standing for 9 days only to come back to a flat battery again.
They're going to replace the battery to see if it is faulty.
Why can't it use the HV battery to keep the 12V battery topped up and run the electronics when the car is idle? Seems like a bad design.
