Quote Originally Posted by R6_Don
I would say that if you can bump start it and still drive it without the car dying then its the battery at fault and not the alternator. If it was the alternator then the car would just run out of power and roll to a stop, Where as if it was the battery once the car is on the move it will be kept going by the alternator untill you next stop and then you will find that there is not enough power stored in the battery to get it going. Im no mechanic but just going by my own personal experience.
Spot on as far as car batteries / electrical problems are concerned.