Went to the car this morning battery flat nothing left on at all 

 

 

 

 

Cold kills batteries, happened on the Octy and on the Honda no warnings just dead....the cells break down over time and once a cell goes so does your bank account. When getting a new one get the greatest Ah rated battery that will fit, my 1.9 Octavia had a 50Ah battery from the factory, replaced with a 80Ah one that only lasted 5 months...a bad one I guess. The honda  battery died 'cos the Mrs would do 2 miles with everything on never even getting the car hot, bloody Oxford traffic....