Hi peterf1980,
Thank you for using the Apple Support Communities.
We understand that your iPhone Battery Health is at 86% and we're happy to help! Please note that "All rechargeable batteries are consumable components that become less effective as they chemically age."
For the best battery life possible follow the recommended steps found in the Apple resources below.
iPhone Battery and Performance
Batteries - Maximizing Performance - Apple
About the battery usage on your iPhone, iPad, and iPod touch
Have a nice day.