Question: why is my battery not holding a charge? on 1997 Mitsubishi Eclipse

Have replaced battery, alternator, timing belt and disconnecting elect.comp.one at a time. Any ideas please? Back windows stuck in upright position also. When the car is turned off it is dead. Thanks

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2 answers
Have alt. bench tested for possible internal failure. Was problem with battery drain present before alt. replacement and also when did the rear windows become inoperative?You say when car is off it's dead. Safe to assume you mean no headlights , door chime with key in ignition ETC.? After you shut car off and it's 'dead' WHAT do you do to restart it?
HI, BEST WAY TO FIND YOUR BATTERY DRAIN IS TO DO A CURRENT DROP TEST. DISCONNECT NEG. BATTERY TERMINAL ATTACH A TEST LIGHT BETWEEN TERMINAL AND BATTERY POST,WITH ENGINE OFF TEST LIGHT SHOULD BE VERY DIM IF BRIGHT START REMOVING FUSES ONE BY ONE TILL THE LIGHT GOES DIM.HOPE THIS HELPS