Yaris 2018 - new battery?

[digitron]

Hello everybody, my first post here :)

I have Yaris 2018 (NSP131L, 1,5 VVT-iE) and it has stock VARTA battery. Car runs fine, but today i've noticed that it took a few seconds more to start (cranks few seconds more than usual to start).
It's around zero Celsius here, and the car was parked outside for three days. I've noticed that last year during cold days, but this time it was significantly longer.

Later during the day after the car was parked for a few hours i took DMM and measured 12,19V while car was turned off. I took another DMM to verify readings, and the battery voltage was 11,95V. Car started almost normally (maybe 1-2 secs longer crank period than usual) and i took reading while the car was turned on. Voltage with headlights on was 13,9V which indicates that charging is OK. I could not measure voltage while starting because i was alone, and i didn't had long cables and clips.

Is it time to replace this battery due to voltage and age?
During last month the car was driven on short relations, maybe the battery just needs full charge?

If time is for replacement, is there any special attention to be made regarding computer? As i understood ECU will lose short-term memory, but i will drive car on open road (outside of the city) for 1 hour so the computer can record its parameters again. Is that OK?

many thanks for any comments!