battery drain

I've been letting my 2017 Tundra Limited sit more than I used to since I picked up an old Avalon Hybrid to drive around. I've been having a battery drain issue...The first time it happened, I thought for sure it was a bad battery, so I replaced it with a new Interstate 27F. 6 months later, I go back to the truck after a month or so of it sitting, the battery was dead/dead. wouldn't even take a charge. I replaced it in warranty.

Today I go out to start it after about 3 weeks of sitting and the battery is low enough to not start the truck. I was able to jump it and it is now charging.

Is this normal? I've checked and double-checked and there was NOTHING left on, not even the lights or interiors. nadda.

How fast have others gone low like this? Any suggestions? If I only let is sit for a week or two, seems to be fine....

Thanks!

 

Do you have an alarm and/or dash cams wired for security? I have gone 4 weeks and no problem with battery starting.

GL with tracking down the draw

 

Nothing extra. Even disconnected my hardwired bed lights and bumper light.