I never disconnect the battery when I park for extended time. I just make sure to turn the car off, remove the Bluetooth adapter from the OBDII port, lock the doors, and leave it sit. I suspect your telematics unit locked up and drained your battery when you were not driving your car.
Others have noted issues with Optima batteries after manufacturing was moved to Mexico, but I continue to have good service from them. I wish I could have kept the one that was in the 2011 after it was totaled because it was fine and would have made a good jumper battery. The one in the 2015 was manufactured in Mexico and doing fine after almost 2 years when I traded the car for the 2019. I plan to put a new one in the 2019 as soon as the OEM either shows weakness or starts gassing enough to cause corrosion under the hood. I recently put a new red top Optima starting battery in my Jeep Comanche because I killed the one that was in it which was over 2 years old--vehicle was parked in a location where I could neither disconnect the battery nor put a charger on it so the small drain from the electronics completely discharged the battery and it sat that way for almost a year. I was not surprised that it would not take enough charge to start the engine even though it took enough charge to light the lights.
Silver LEAF 2011 SL rear ended (totaled) by in-attentive driver 1/4/2015 at 50,422 miles
Silver LEAF 2015 SL purchased 2/7/2015; traded 8/10/2019 at 82,436 miles
White LEAF 2019 SL Plus purchased 8/10/2019