Sounds like something is draining the battery, as in some accessory is staying on when the ignition is off.
A simple test is, with a charged battery, to disconnect one battery cable and connect an incandescent test light between the battery post and the disconnected cable. Be sure the hood light is disconnected, ignition off and key removed, doors shut, everything electrical off. If the light is off or glows dim, that is normal. But if it is full brightness, there is a drain. Start pulling fuses, relays, wire connections until the light goes out. Trace that circuit until you find the drain. The alternator would be a good place to start. Other suspects would be brake lights, glove box light, interior lights, trunk light. Check harness plugs under the hood and through the firewall, especially those exposed to water or battery acid, the green corrosion is conductive. Could be very simple, and it can also be some mystery module that will stupefy the most seasoned expert! Won't know until you get into it!
As far as the batteries that it has killed, could be they are just completely drained. Some of the automatic battery chargers won't revive a totally discharged battery. Try connecting the dead battery to a good battery with cables. Attach the charger to the dead battery, get it charging, then remove the cables. Chances are it will charge up.
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Today's Featured Article - Chores - by Frank Young. The ceaseless passing of time! It is at once our friend and our enemy. It measures our progress and it makes us old. Like most features of our life, few things are all good or all bad, and most such judgments depend on our own perspective or viewpoint. In our particular hobby, we enjoy the nostalgic return to the days of our youth as we recreate many of the scenes that took place on the family farm that served as the stage for the first few acts of the play that is our live
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