iPhone battery issues

I have a 6s that is about 18 months old, it was running along on iOS 11 since the start quite happily, could easily get a whole days use from it. I avoided updating the OS as I'd heard all the rumours about apple deliberately doing stuff to make the batteries worse in older models etc, whether that was true or not is beside the point, I held off on the updates.
A couple of days ago I got a new iPad that is running iOS 12 and I thought it should be okay by now, update to iOS 12 on the phone and it now only lasts half a day before its completely dead, even with minimal usage. Today I took it off charge at 7am, listened to a 1.5 hour podcast and made a 5 minute call and a couple of WhatsApp's, its now dead.
Googling hasn't helped, some reports say just wait for things to improve (when has that ever worked with technology), some say it is the way I'm using it which isn't true, I've done all the battery saving tips but nothing is working.
Anyone else the same? I resent paying for a new battery as it was fine before the update. I knew I shouldn't have updated.
A couple of days ago I got a new iPad that is running iOS 12 and I thought it should be okay by now, update to iOS 12 on the phone and it now only lasts half a day before its completely dead, even with minimal usage. Today I took it off charge at 7am, listened to a 1.5 hour podcast and made a 5 minute call and a couple of WhatsApp's, its now dead.
Googling hasn't helped, some reports say just wait for things to improve (when has that ever worked with technology), some say it is the way I'm using it which isn't true, I've done all the battery saving tips but nothing is working.
Anyone else the same? I resent paying for a new battery as it was fine before the update. I knew I shouldn't have updated.
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In Settings/Battery you do get to see "Battery Health" and what's been using it - perhaps worth a check there?
I’d be doing that if possible.
I am not sure. You have no chance.
ABCC Cycling Coach