Question: 2012 challenger power issues?

By | May 17, 2018
recently i have installed a after market radio and have been gaming on it for hours at a time. now my cell battery is dead idk how though my car has 960 watts hourly my wii and ps2 only use 45 watts with my invertor. i play my gaming system with the car fully on as as well. also when i turn it on it makes a knocking cranking noise for about 1 min but turns on fine then doesnt make noise . what could all this mean