| | New battery flat - charged 25 hours, instant flat |  | 
 Hi all,
I replaced the battery a couple of weeks back for a 90ah Varta Blue. Alternator is charging the battery as confirmed by RAC.
 
 After using the auxiliary heater, doing lots of short runs, I found yesterday I had a flat battery. I unlocked the car, got in, put the key in and turned it just clicked and went into dead mode instantly upon putting the key in the ignition and turning.
 
 I left the car on CTEK MSX 5.0 for 25 hours. The charger showed the charge process complete and successful this morning.
 
 I turned the key this morning and exactly the same thing happened, completely dead car. No locks, nothing.
 
 Duff battery ?
 
 What kind of drain in the car could drain the entire 25 hours of charge if the battery is OK?  This doesn't seem very likely to me.
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