19 percent in one hour? You are doing something grossly wrong.
I have had my iPhone 6 Plus for over two years, and with lots of use during the day it will be near dead by the time I leave the office, but its still plenty alive. A battery replacement is needed in the somewhat near future, but it works just fine. The only reason you could have such poor battery performance is because you must have cellular data turned on for everything and have never closed any apps or restarted your phone. Always keep your phone plugged in when possible and you’re battery will last much longer than you ever thought it could.
Thanks. Wev e spent many days with Apple tech people and have closed unneeded apps and turned lighting down and about twenty more steps. They keep saying the batteries test good and we keep having to carry backups.