ok so off charge for 5 hours and 91%, although SOT only risen to 21mins as it's been sat on my desk. Not sure if that kind of background loss is normal? I do have my work emails in Nine syncing and Slack
UPDATE - After lunch now 7 hours since charge bit of FIFA mobile for 36 mins and general playing got 74% with 1hr 30 SOT
Considering that you've got the 2,800 mAh battery, I'd say that's not too shabby performance. Honestly, unless you find that you run out of power before you have the opportunity to charge it, based on your use patterns and habits, then I wouldn't get too hung up on battery life. I don't care what phone you have, you're going to be charging it every day.