So I have a LiPo bag for my batteries. It's one of the triple bags where all 3 batteries fit. It has dividers and such to keep them from touching. After a flight the other day I left 2 of the batteries in the bag in my hard case. Yesterday (probably 5 days after my flight) I took them out to check the discharge level and both of them were warm to the touch. I set them on top of the bag for a while and they cooled down just fine, but this is concerning for longer trips. Is this normal behavior?