Got a S1. Battery went flat due to alternator problem which is now sorted. Battery shows 11.8v now but when i try to start the car it turns a couple of times then the battery dies and the starter motor starts to click. I put the jump leads on to my van and she fires up on the button as she always does. I presume it is the battery but why when it has nearly 12v will it not start the car ? cheeRS in advance