19' No start and nasty smell in cab

[Tomsws6]

Good morning everyone...................................................Well.......................... Short story is - I got back from week long vacation last night and I went to start the truck as I had a 5am flight and just wanted to be on the safe side. So I charged it for a bit and it started. I let it run for about 5 min or so thinking it was good. Got in the truck at 3am to head to the airport and got nothing. Just the "click". Well I hooked the charger and when it started to register it still wouldn't start after 20min on the charger. Hooked my sons car up with jumper cables and after a few minutes it started. Normally I wouldn't post about it because I had to replace the battery last yr and only replaced one of them. So I figured it caught up to me but still only last yr? Thats not the weird part as there is a nasty smell in the cab. I have a code for the DEF sensor that popped up 2 weeks ago but its run fine since and even driving it an hour this morning I didn't have any other issues. I went out to start it again and I got nothing again even after driving it over an hour (didnt make the flight so i came home).. So I was thinking battery but what about the smell? I would say its rotten eggs but not quite and I had the relay recall done so it wouldn't "catch fire" last fall. This sound familiar to anyone?

 

[superjoe83]

A defective battery can offgass and smell like sulfur

 

[Tomsws6]

Thanks. Kinda where my mind was but most threads kept taking me down rabbit holes in regards to the smell and none really brought up the no start as well.