No charge under warranty. They got me for $350 for a new factory FOB, since the previous owner lost the other one.
There's always a game afoot. Knowing two guys that own multiple dealerships, I've heard it all. People do things that they'll never admit to, just fix it for free. Lost FOB, that's not their problem. My brother had slicks on a 67 Dodge Dart, 273 4 barrel, 4 speed, new. Dumps the clutch at 5 grand, the car jumped forward and took out, a motor mount, transmission, screwed up a universal joint and the rear end in one big bang right in front of our house on a concrete street. He jacks it up, takes off the slicks and phones the dealer. They fix it, for free, how I'll never understand. On the way home he gets it to third and it locks up. They accidently forgot to fill the transmission. The mechanic got fired and the guy that started it all, my brother, gets another new transmission. Of course my brother was right, he's my brother.
Everything Mike said was spot on. If you let your car sit and the battery runs down, that's not the cars problem. If you want it fixed by them, play the game. My 2019 Durango just turned 22,000 miles on it. The battery is six years old and acts like new. Although it's low mileage, I take it out and on the highway and let it stretch its legs to keep its parts moving. I've always been told that it takes about 6 miles to bring a battery up from what it used just to start it. What would happen if you sat in a chair for a month and then jump up and started running, nothing, you'd fall over from the onset of atrophy till you got stretched out again. Get that battery for free and start driving it.
With all that being said, dealers will screw you. I've also listened to their stories on how to make money. When one of these guys died and his dealership was sold, the guy that bought it got busted for fraud. Free oil changes for as long as YOU own it. While changing the free oil, the free inspection starts and so did the up charges. You tell a helpless old lady she needs brakes, guess what happens. The fish can smell from both ends.... It's always about the money............