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Question: Battery looses charge - Maxima GLE

If I don't drive the car for one or two days, the battery looses all its charge. I can't find any light on that could be causing the problem. I replaced the battery twice in the last two years. The last time it was 5 months ago.
The auto radio antenna doesn't work. The passenger's side rear power window doesn't work either.
I know there has to be something draining the battery.
I installed a disconnect switch in the positive post and I disconnect the battery every night and this "patch" keeps it going.
How can I troubleshoot this?