As kowal_joe mentioned, keep an eye on your A/C usage and STOP/START “working/not working”. I don’t have this feature on any of my vehicles, and I’m gonna try to avoid it with my next new vehicle purchase, but I’m pretty sure I’ve read here that use of A/C deactivates STOP/START.
You may have had a battery issue, but your use of A/C may have also been disabling STOP/START. Two “issues” at the same time...
A/C operation doesn't deactivate the stop/start system. The system takes into account cabin temperature, sun load on the dash sensor, fan speed, outside temperature, etc. to determine whether or not to shut the engine off or not. My 2019 2.0t follows roughly the following (climate control in auto for all conditions):
1. 95+ degrees - never shuts off
2. 80 to 95 degrees & bright sun - shuts off rarely
3. 80 to 95 degrees & low sun/clouds - shuts off frequently & restarts within 35 to 40 seconds
Below 80 degrees (and remember, these are approximate temp levels) the system activation is strictly potluck. In Tucson we can have bright sun on a 60 degree day that will keep the engine from shutting off most of the time and on a cloudy 90 degree day have the engine shutting off at every stop light.
Qualifier: This is how "my" 2019 'Nox operates, where "I" live, and how "I" understand the system to operate. YMMV