[RoryH]

My 964 has flattened it's battery completely (even the clock stops) twice in the past 2 weeks. After the car has been jump started battery recharges and all Is well until the next time. The car is used every day. The battery discharge is within a couple of hours of stopping and even after long runs.
As far as I can tell nothing is running after the engine has stopped. Battery connections are fine. Battery is about 2 years old and sealed type.
Is this a dead cell?