GV80 battery COMPLETELY DEAD after parking for a week

My GV80 is 16 months old. The electronics continuously eat into the battery charge even with the car stationary and idle. I recommend if you are leaving your car more than two weeks, put a “trickle charger” on the battery. Access to the battery is easy in the rear. We were gone for a few weeks last year and I began getting messages on my Genesis phone app of low battery. When we traveled earlier this year, I put the charger on the battery and it was perfect when I returned home. No warning messages.