Replaced the battery today. This is the third battery in three years – must be due to the reason that last two years the car did spend whole winter in repair shops and I doubt that they did recharge my battery during those 4 months (although I sked to do it and left the charger in the car). Did check whether there is excessive discharge and measure 0.02A (between the negative pole of the battery and the negative ground), which is not ideal, but not bad.
Will go to track day tomorrow.
Video from another recent event.
https://www.youtube.com/watch?v=LicqSktcQDM