Battery Drain?

[Purplecty]

I parked the 4.6 in the garage Saturday afternoon and Tuesday at 130am the alarm started going off a bunch of times. The key would not turn it off due to the battery being so low. I somehow got the alarm to turn off and later that morning I opened the door to find the battery completely dead. I have had the X parked for way longer than this before but the temps have been a bit lower, but I am not sure what caused the battery drain. I had to throw the charger on just to get the trunk open. I left it like this while I had work for a few more hours and checked periodically to make sure the shifter light was off confirming she is properly going and staying asleep. I later proceeded to pull the battery to hook up the charger directly to it. I left it on a 10amp charge for around 8 hours and then set it to 2amp later in the evening. The battery is now fully charged and im wondering if it's worth having the battery tested to rule it out as being bad or maybe something else is causing the battery drain? I scanned the car with ISTA and did not have any new or sensor related errors (I was checking for the common hood sensor issue or anything else similar). Any ideas would be greatly appreciated...