Whats draing my new battery on my nissan sentra sv 2013?

That's a serious short look for any obvious wiring problems ., pull some mega fuses just not the one for the computer with a drain that much you may see a spark , then try the smaller ones in the dark . Once you isolate it you can find the problem . If you have something plugged into the lighter that may be the problem even if it's not powering anything . Or take it to a shop you can trust .

With a good battery feel the alternator, if it is hot to the touch with the engine cold then you have a shorted alternator. Other ones could be a wiper motor not fully parked, power seat switch stuck closed.