That U-1 size battery box should fit just fine. Thanks.
The lunch box looks good but pricier than what I want to spend.
I had a battery hold-down strap left over from installing a battery tray in my boat. I was unable to remove the tray from the Tahoe without first removing the fuse box. I removed all bolts from the tray and lifted it up just enough to slide the plastic/nylon hold down strap under the center of the tray from left to right. I pulled it from the front side next to the fluid reservoir, then reattached all bolts. It is in there tight and won’t pull loose. Now I just need to find the right storage box.