Jeff,
With everything in your aircraft turned off, place an ammeter in series with
the battery. It should read zero, if it doesn't then you need to start
looking for something discharging it.
Another (less likely) scenario is that the battery has an internal fault and
is self discharging. I have a couple of thoughts on how to check this, none
of them simple so let me think on it a bit more.
Question, have you taken it down to somewhere like Batteries Plus and had
load test. The battery will need to be fully charged first.
Paul
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