I was away and left my 2018 (15K) for 3 weeks. When I came back car was dead. No lights, no dash, nothing. I put a battery charger on it for about 20 minutes. Now everything lights up. Tried to start it with charger hooked up and nothing. Waited a little and nothing. So I called Subaru service and they wound up towing it to the dealer. I told service rep it wouldn’t start. Next day he called me and said it’s fixed. They had to reprogram the computer and FOB. He said the computer locked because I tried to start it with the charger hooked up. This makes no sense to me. Anyone experience something like this. I would like to know what to do next time my battery dies. I keep one of those compact battery chargers in the car.