I have a 2005 STS, bought it new and I used it as a second car. The last few years I’ve had issues with the battery going dead, for what doesn’t seem to be any reason. It has a fairly new battery, a few months and when I went down to drive it today, it was dead. While sitting in the car waiting for the jumper cables to be hooked up, the car lit up like it was starting but it wasn’t. The start button lit up, not the acc light, but other items lit up like the car was running. Of course when I tried to start it, it went dead. After I tried to jumpstart it and did not work, I put a battery charger on the battery, charged the battery and nothing.. HELP!!