Went to my car on Christmas eve and battery was flat. (Banner) Put it on Ctek conditioner and kept getting an error at stage 5. Decided boxing day was too good a day to miss so got the car started and went for a short blat. Came back put the car back on conditioner and recon - battery seems now to be revitalised. Not sure for how long but never realized you could bring a battery back to life. Looks ike sun out again today.