Your 85% battery is like saying your car that had a 10 gallon gas tank now can only store 8.5 gallons of gas. So yes, the tank empties out about 15% faster
So if your phone in new condition needed a charge after 10 hours of use, it now needs a charge after 8.5 hours. That is not a huge difference.
My 4 year old iphone battery health is only 81%. Rather than replace the battery, I have a couple of magsafe chargers in the house that i can just set the phone on anytime for a boost. I also can charge in the car.
As someone else mentioned, if your iphone is starting to “swell”, then your battery is failing and needs to be replaced immediately
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