Battery pack pop?

[PowerJrod]

So I'm sitting in my Ram this morning for about 10 minutes after getting to work...I hear this "POP" noise come from behind me. Now...I've heard it before, same thing...about 10-15 minutes after getting to work and while sitting in my truck after turning it off. The first time I heard it I thought maybe it was a bottle expanding as the air got warmer. This time there wasn't a bottle in the back seat. Normal function? Expand/contract of the battery pack? Thoughts? Lol.

 

[HeliPilot]

Probably all of the electronics inside the truck going into an overnight sleep mode. May be creating a static pop though the speakers. Just a guess.

 

[PowerJrod]

Probably all of the electronics inside the truck going into an overnight sleep mode. May be creating a static pop though the speakers. Just a guess.

Hope that's all it is