Battery Drain

Hi Folks: I was just working on a 2012 Chrysler 200. Battery was very dead, less than a volt. Put a new battery in, and found a drain that settled to 400mA, and went up to an amp in a few minutes. I figured that would kill a battery in a day, so I thought I’d dig deeper. The battery is buried in the wheel well in front of the front driver tire, so pulling a terminal off until she can sell It wasn’t a workaround. She’s selling it because of this battery draining problem, BRW.
In the engine compartment, there is a fuse box. There are two small fuses in this box, closest to the windshield. They are housed in a kind of clip. Squeeze the ears and pull it up. It didn’t come out, but I guess this is how they ship the vehicles, so the battery doesn’t drain from all the circuits, apparently running in the radio. The vehicle still starts with these fuses lifted, but the drain goes to zero in a couple of minutes, I guess, when the computer goes to sleep. Maybe the radio is just n some demo mode? All I see on the screen is it failed connecting to something. Bluetooth? Cellular? Too complicated for me…
Harry