Daniel
I am also facing the same issue. I have started using Nothing 2a (actively with sim) from 20th March (Now it’s 3 days) and initial day there were no issues. I think it’s after the update.
- I tried using 4G network and wifi instead of 5G.
- Sleep standby optimisation and battery health are enabled
- Instagram is taking too much background activity even though it’s restricted. Currently I have uninstalled it.
- Google is taking 16 hours of background activity on optimised mode.
- Even the haptic feedback was off and refresh rate is dynamic.
- I am using Nothing CMF 65W GaN charger.
- Using adaptive brightness and adaptive battery.
I don't think it could last more than 5 hours on a normal use. I don't even installed any games here or any heavy apps.
Currently, I have uninstalled Instagram, changed refresh rate to standard and going to use 4G or wifi for the day. Then I’ll give the updates. I did bought this phone for normal use and it can’t even do that well. I hope nothing could fix this on next update ASAP.