I'm going to be taking in my old phones for battery swaps in the next month. I have 3 X's 92-94% and they don't reflect it because two surge from full charge to 60% after only a few hours in Airplane mode so I'm going to just take in everything while I can get it done cheap.
I plan on selling my X for the XR, but if I kept it I would be swapping it. Launch X, 92%. One of the main draws for me for the XR is the outrageous battery life.
My launch day X is at 90%. I try hard not to let the battery get lower than 40% before charging again. I only use the iPad charger or my wireless charger.