My 5s battery doesn't last as long and I'm seeing a commonality with everyone else on other models

I see people with 6 and 6s and even a normal 5 having battery issues I'm assuming others with the 5s are having this problem too? I see there is a battery replace for the 5 but nothing else. I find it funny to offer a battery change for devices that no problem before nine. I hope there is a fix coming for this because by the end of the day im now down too 17% where I used to sit somewhere between 30-40% and don't say it's the battery. Any insight from anyone else?