Interesting ... If you press the battery test button on Mavic Pro  batteries, does that reset the discharge timer too? ... Might explain why my batteries don't seem to discharge as I'm always checking them to see if they have ... doh!
I have my mavic pro batteries set at 5 days and I pick them up and place the bottom of them against my wrist and on day 6 the battery gives off a small amount of heat and they tells me it’s doing the discharge . After I can’t feel any extra heat coming from the batteries I will push the power button and check but I give them at least 4 days to discharge . I keep my batteries in a ammo can stored in a cool spot . Very easy to feel the discharge heat