Went to set up the days my batteries could stay charged on my app, of my four batteries 3 of them let me go up to 6 days of being charged but one only gives me the option of going up to 5 days has anyone else noticed this?
You don't, If you have purchased a new X‑Star drone after October 1, 2016 everything is up to date. Bought a new battery and Autel told me they are all up to date so just go and fly is what they told me.
Unless one of your batteries was new-old stock on the shelf from before Oct 16. Anyway, it's a little too long to describe battery update in a post, but you can watch a vid on it on the autel website. Pretty easy once you watch it.