Here is my run on M3, Lean kernel 1.10.0 Stable, no settings changed, a 2100mAh starting @ 100%, Screen time out set to 10 minutes so it could ring up some screen time.
WiFi always on until this post, LTE always on but no 4G, not a lot of use, a few games of pool, a little mapping, a few calls etc.
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I know your percentages will be a little off since you're using a higher capacity battery, but Im giving lean1.10 a shot. Ive been on franco13.1, so we'll see. On average, franco13.1, for me, was good for a little over 3hrs screen time. Which includes a little everything, text/browse/gaming. I have wifi on when possible, and lte always off.