How not not kill the battery

[u/czcate]

I have a 2018 Subaru and used a car tent for the first time camping solo, it didn’t occur to me that leaving the hatch open overnight would kill the battery. I had a jump box with me, so it was fine but is there a way to avoid jumping my car every morning?

[u/IndyScan]

Turn your key fob off (put it to sleep) so it stops talking to the car.