Battery draw - How much it too much ?

I have no proof just yet, but I'm curious if I have a constant draw on my battery while the car is not running and Key-off/removed.

I understand items like the radio clock and Memory in the computer require a constant supply of voltage to maintain their settings.

Do you have any idea how I could determine "IF" I have a potential short which is resulting in an additional draw ?

I typically use a trickle-charging because I don't want to get stuck when I do take the car out.
 
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