Make sure there are no lights staying on. Check the interior light, the trunk light, glove box etc. When it is shut off, pull your fuses one at a time and see if any of them spark, that shouldn't be, when you put it back in. If that all checks out, it will likely be your starter draining it and it will need to be replaced.
Take a battery cable off, and when you put it back on, it should spark a little bit when the key is off. If it sparks a lot, i would guess it would be the starter.
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