So i went out this morning, the car ran great, came back, ate, then decided to leave, i get in the car, and it doesn't crank. First i said i needed a jumpstart, so i then jumpstart it, it took a long time then it started, checked the voltage with a multimeter and it said 12-13v. kept it running for a while, then killed the engine, tried to restart it, it made a clicking sound, then went dead, i went to ceck the batter with the multimeter, it read 0 Volts. jumpstarted it couple of times afterwards, battery still wont catch the charge? what's the problem?