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So now that we're clear on what caused the dead battery (twice), are you guys still convinced that it's a weak/dying battery, or are you thinking there's something else at play?
I'm not sure that the accessory delay feature is part of the problem here, since it refers to the accessories (radio, MFT display, etc) remaining on once the vehicle is turned off. In this case, I'm referring to having the key turned to accessory mode, so it's not as if there's some "phantom draw" happening. I've told the vehicle to run the accessories while I was doing other things (washing and vacuuming). I've never had a car kill a battery in 15 minutes of being in accessory mode, but this is what's happening here. Maybe the fans were still running (since we had the heat on when the car was running) while it was in accessory mode, and that killed the battery. Or, maybe the battery is on it's last legs and just doesn't hold much of a charge anymore...?
To answer your quesiton: No, nothing is/was plugged into any of the power ports in the vehicle.
Of course something weakened the battery - I know that leaving the car in accessory mode will do this. But I've left cars in accessory mode for HOURS before, and they still started fine. This is my question. Does a 'dying' battery hold less of a charge? If so, this would be why 15 or so minutes of the radio/accessories being on drained it enough that it wouldn't start the car.
I appreciate the suggestion, but I'm not sure I could trust any Wal-Mart house-branded parts in my vehicles. Maybe I'm just being thick-skulled, but I just don't trust it. I'll look into who manufactures for them and see if I can get some technical details to ease my skepticism. On this note though, can you go with a higher CCA/CA battery without any issues? It just has to be a "group 65", right? The rest is interchangeable?