Is this the same "P.O.S" car in another thread? I am no expert,but maybe leaving the key near the car,caused it.But then again, BMW does not specify anywhere that leaving the key near the car can cause battery failure or voids any warranty. About the "P.O.S" adjective,keep in mind that in this forum we really like our cars.Just my simple,honest opinion. Anyway hope you resolve your issues and be able to enjoy your 1.
135i Coupe N54