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 - Seeing an Old Friend - by Joe Evans. Dad had a concrete contracting business starting in 1960. One of his first pieces of equipment was a Ferguson TO-35 with a Davis loader. Dad replaced the TO-35 with a MF 202 Workbull, essentially an industrialized Ferguson 35 I am told. Dad bought the 202 new in 1962, and I recall quite clearly going to the dealer with him to sign for it.
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