I get it! I have some experience with poor signal strength and the resulting impacts in battery life. I live in the country and the poor signal drains incredibly quick. Not sure if the locker is interfering. I can’t recall how your Xr drained in the locker? If it did not drain that much, maybe it truly is a phone issue versus signal.
I’m glad to hear it’s been a little better lately, I know it’s frustrating.
No the signal isn't an issue. I know being in a locker you'd think it would suffer, but nope. I'm on Vodafone which supplies all our work phones here too as the signal is that good in this area.
To be honest, I'm really happy with that battery today, so knocking AoD off tomorrow until I finish will hopefully get me even better results.