That's an impressive analysis, DiabloNL.
I think you and HarryT are
both right, actually, because you seem to be explaining different points. You, that the "resting" battery drain is rather high, and he that a month between charges is ample.
For myself, I'd agree with both of you.
From my perspective, the length of time it
does last tends to cancel out the self-draining aspect, but that's just me.