12v battery dies overnight 2013 S

[LeftieBiker]

Same problem with a 2014S. Replaced my battery with a very good one about 3 months ago. Down at 4 V today after overnight charging of the car from 8 pm to 4 pm. (20 hours). Any updates? ODB has been in. I'll take it out.

How long was the car still plugged in after charging? It would help others to know a ballpark figure for how long it takes an OBDII reader to drain a new battery in that circumstance.