I bought a 2010 Golf in march and I do not know how old the battery is (no dates on the battery) and with winter coming in I feel a bit nervous.
I do not use the car very often but I try to give it a 30min ride once a week.
The car is parked outside on the street, no garage or access to power socket to charge the battery.
Before driving, the battery will typically show 12-12.15V and the car starts even at -5°C. After driving 40min the battery shows 12.7-12.75V. Measures were made with the battery connected and car locked to minimize load. A few days after driving the battery will be back to ~12.1V.
Is my car battery health OK or is it close to end-of-life?