batterry dies overnight ???????????

Hi 93 maxima battery dies overnighte , I determined that the draw is about 0.90 Ma when the car is off, and I know it is on the circui which is protected by Elecron Bat sometimes marked as (Elec Parts) fuse (that is the only fuse that is marked with black letters and on White background. but I do not know what this circuit does or what on it can be causing it HELP!!!!!!!!!!!!!!!!!!!!!!!