I tested it with my charge tester , but apparently I have a dead cell , because it is losing it's charge . My son just got home with the other car and jump started it right off the bat , so I know it's the battery . I tightened all of the connections and put a charge on it , but it won't start witho...

My son was driving home yesterday and had to brake hard to avoid a deer . The car stalled and wouldn't crank . He got it jump started , now it won't start . The battery is fully charged , the dash lights come on when the key is turned on , but when I go to start it , they go off and the starter just...