1995 Ford F-150 battery dying

How is the battery? With most vehicles now a days there is a little draw on the battery when the vehicle is shut off. This draw keeps the ecm memory and also there is a little draw that keeps your radio stations stored along with the clock. Did you notice when you disconnected the battery that you had to reset your radio stations and clock, that is where there is a little voltage draw. Have the battery checked to see if it is getting weak.