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Are you encountering issues with battery life -- as in, did you see your battery life dropping with your usage and then checked the battery health to see if anything was wrong? Or did you just check the battery health and saw it was on 84%?
 
Last month I see that the iPhone drains faster then before. So I just check the batter health. I will try to calibrate it, but I think it will not help.
 
Last month I see that the iPhone drains faster then before. So I just check the batter health. I will try to calibrate it, but I think it will not help.

Yeah, calibrating the battery would essentially just give it another cycle. Won't really do any good.

How long have you had it for? Do you have AppleCare+ on it? If you don't have AC+ and it's still within its year, I'd recommend buying that. Although Apple wouldn't look to replace a battery that's around 85% as it's far from approaching the failure cut-off point, an additional year's warranty should help when it drains even further.
 
I use it about 9 months. Have not AppleCare+. But in my country we have no AppleCare+ support :(

Interest thing that after 2 hours I see 92% of battery health.
 
The overall capacity can fluctuate. Be sure that the Phone is not too warm when check for battery health. I got 82% on my 6s back in January, and now it has 87%.
Similarly, my new MacBook Pro seems to range between 93% and 96% all the time.

PS. I'm using Coconut Battery
 
The overall capacity can fluctuate. Be sure that the Phone is not too warm when check for battery health. I got 82% on my 6s back in January, and now it has got 87%.
Similarly, my new MacBook Pro seems to range between 93% and 96% all the time.

PS. I'm using Coconut Battery

On a sidenote, I think Coconut battery is one of the better battery measurement assessments out there.
 
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