my esc broke

Good morning, I have purchased the following items: X-Car 120A Brushless Turnigy Trackstar 3.5T and, after the first round lasted 2 minutes, broke unsoldered the red cable, reconnect the second try my esc you and purr, opening the cover the componeti inside are unsoldered, I used a battery 7.2 4000mah 50c.
can you tell me what I did wrong thanks