So here is my update:
Based on coconut battery (on Mac), Battery Life (iOS app) and AIDA64 (iOS app) - my iPad Pro 10.5 came with a 100% capacity, and every ten cycles or so it has been losing 2-3%; last result was at 7% loss or 93% of capacity, which is insane, to someone who maintains 98-100% capacity after two years of use is. I made an appointment for the Genius Bar and went today.
I explained everything, showed some screen shots that were cause for my concern, and he ran a diagnostic test. My battery is at 115% of capacity per Apple's diagnostic tools. He was shocked, I was shocked, we had a laugh when he asked if I still wanted to exchange it, and I deleted all of my battery tracking apps.
My five cents is only worry about your battery if you see a radical drop in performance, and keep in mind that these battery apps might be really inaccurate, as it is in my case - 22% off. Only reason I went is because I am going overseas for a few months, and I will be in certain countries where I won't have access to an Apple Store - so if there was a time to do a warranty exchange, it was now.
Good luck everyone, enjoy your iPad, and try not to look at the battery apps too much 😉
Sorry to resurrect and old thread, but this is the closest thing I found when doing a web search. I got a new iPad Pro 10.5 for Christmas and have the very same issue. I've used the Battery Life app on many other iPhones and iPads and it seems to be very accurate. In the case of my wife's iPhone 6 (which was suffering from the dreaded CPU slowdown), Battery Life agreed with the Apple Store diagnostic to within one percentage point (Battery Life showed 97% and the in-store diagnostic showed 96%).
All my iOS devices always show 100% battery capacity when new and for the first few months of their life, with two exceptions:
My wife's iPad Pro 9.7 that she got last spring came out of the box showing some wear. When I ran the serial number and discovered it had been sitting around for months I took it back and bought a newer one. That one was at 100% and has been ever since last April.
The other exception is my new iPad Pro 10.5. I thought maybe it was the same stale stock problem (I got one that was made in August, so it made sense), so I returned it and got a different one that was manufactured in October, and I'm getting these same results. It came out of the box showing about 97% capacity and is now consistently showing 96% capacity. I wonder if there was a bad batch of batteries, or if they charged them right to 100% at the time of manufacture and then left them in a hot storage place for a couple of months (which would kill it), or something like that.
The funny thing is that when I called Apple Care and they ran a remote diagnostic, it showed some nonsensical capacity, similar to your experience (I think it was 115.88% or something unrealistically precise like that). I'm not sure, but I suspect the Apple diagnostic is buggy. (Perhaps they didn't update the denominator in their calculation for the new model or something like that.)
Anyway, they also didn't trust the weird result, and advised me to take it to an Apple Store, because they were under the impression that the in-store diagnostic was different. (I'm not sure that's actually the case, but I have to go in for some other reason anyway.)
I will do that and report back, but it still leaves me uncomfortable. My history with the various devices and the Battery Life app gives me reason to trust what the Battery Life app is saying more than Apple's diagnostic in this case.
