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See if your alternator is charging it. Get a cheap volt/Ohm meter with amperage checking capability on it if you don't have one and set for 12 Volts DC. When running and low battery (usually after it sit for a while), see if you have around 13.5 Volts. This will tell you that your battery is being charged by the alternator.
Also check all connection on all cables running to the battery (ground and hot). For example, battery connections, ground connection and alternator connectors should be clean and free of oxidation. If not, your alternator cannot recharge the battery if there is not a good connection.
If the alternator and connections prove OK, then remove one of the battery cables (I would pick the ground). Place your meter on the highest setting for amps (milliamp settings are the lowest) and connect one lead to the battery terminal and the other to the cable you end you just removed. You should have very little current displaying, since the only thing running with the key off is probably your clock or alarm system if you have one. If you do not get a reading, start lowering you amps range selector on your meter until you get a reading (you won't have to do this with a more expensive meter with automatic range setting). If it is in the low milliamps, then you don't have a problem. If you have a significant current draw, say 500 milliamps or more (just a guess), you probably have something shorting or drawing down your battery.
To find the problem remove each fuse and check the amps across the fuse terminals until you find the culprit.
Hope this helps you.
Gary
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My 85' 240 had a drained battery after 2 weeks of sitting...twice already with new battery [200][1985]