iPhone 6s have battery 1690 mAh
iPhone 6s, iOS 9.3.2
The real question is, why trust a third-party app to give you that information?
My iPhone battery drain from 88 to 80 in 7 hours I will try test by app.
Your battery went from 88% to 80% in seven hours, and you find that to be a problem? That is using a little more than 1% per hour. Under normal use, mine will use around 3%.
When not use it down from 88 to 80 in 7 hours. But When i use it down 10-16% per hours. it normal ?
Yes, that sounds normal.
This link might help: http://www.apple.com/batteries/maximizing-performance/#ios.
Also see the "Power and Battery" section (approximately half way down the page) here: http://www.apple.com/iphone-6s/specs/.
Again, depending on your usage. But the 8% discharge when not in use over a 7 hour period sounds quite normal.
iPhone 6s have battery 1690 mAh