no power

Hey SpoolStreet! I'm fully new to this group and ready to discuss something that has been going on with my 07 335i e90. Recently, my 335i all suddenly started to not make much power and have been noticing at 2-2.5k RPM the whole car shutters and shakes struggling to hold power or something...

Had issues with my old battery losing charge so I got a replacement AGM from PepBoys to replace it. I've done this before and it was fine. On the latest replacement, when going to register the new battery I realize I have no power whatsoever to the car. I insert the key fob and there are no...