What do i need for my car audio system so the battery wont die?

hi, i want to know if theres something that i can do to my car so the battery wont die quick it only plays like 2 songs and it dies. I have an alpine 50watt stereo. Hifonic 12"750watts subwoofer, an mtx thunder4500 i dont know how many watts that is, a kicker amp zr-120 i believe but it bumps loud and a scoche 500k micro farad capacitor