do not replace anything yet ! first check the electrical system . disconnect the negative cable ,& S0 H5 r. w' ^+ K
connect a test light between cable and battery post . if the test light lights up bright , there could be a short circuit somewhere . pull out each fuse to see until the test light goes dim ,: j7 C& |' }) V6 @+ N
now you know in which that device is draining the battery .