You can tell it's winter, can't you, with all the recent battery threads. Well, here's another.
Mini Cooper 2003.
I got home from a fast ~60 mile motorway run at 4.30 am this morning. Went out to about 10.30 and the battery was as flat as a pancake - not even a glimmer of any lights. Measured 0.5v.
Clock lost time but radio retained code.
Got a jump start and it started ok. Went for a run, tried switching off and restarting a few times while on the move and it restarted ok.
Voltage on battery terminals while idling ~13.6, rises to 13.8 on a fast idle. When switched off voltage ~12.7, drops to ~12.5 after a couple of min and stays there. Does not drop appreciably when headlights turned on.
Checked boot light, interior light not stuck on, ok.
Battery is about 3 months old, a Bosch Silver S002.
It's _possible_ I might have left the headlights on when I got home this morning, I was pretty groggy when I got home and just wanted to get to bed. Would that have been enough to totally flatten the battery in six hours (between 4.30am and 10.30am), or is my new battery f***ed?