Lower power in cold days?
This is a cold week in Poland - 6-8 C. I notify around 15% decrease of max speed and lower acceleration . I am not sure if it is a result of much more heavy clothes which hits aerodynamics - but it looks a bit strange.... or TCmax works much more sleepy in cold weather? It is not freezing - so I am not sure... but I see quite big difference.
Anyone notified anything like this?
Yes, it is normal.
If you remove the battery and bring it to the bike in the morning when you are going to use your soco you will have normal power and acceleration. Voltage changes with temperature and if you have a cold battery the resistance in the battery is higher which means lower power. If you drive in 0 C you will drive much shorter distance than normal.