Hey @Marklymer ,
I would be happy to help you with this. Can I ask if you are using the charger that came with your phone? If so, can you let your battery run down to below 50% from a full charge and then send us a screenshot of your battery usage? You can get this by going to: Menu> Settings> Device Care> Battery> Battery Usage> Tap on the graphic displayed on screen and send us a scrensshot of the first 5 apps listed so we can see what is draining the phone's battery and advise you further.
Can you tap on the graphic and send us a new screenshot of what you see on the page that appears after that @Marklymer ? I can also see that with a 46% of battery left the phone is still having 9hours of use left which look right at first sight.
Clear data in the device care app , tbh I don't like using fast charge , I think it's better to charge it normally but everyone to their own , clear cache in chrome app and also go on YouTube and search how to reduce battery usage on play services because that should be a low %