Millions of Volkswagens ran billions of miles with the battery under the back seat.

That said, I see no reason to remove it from it's original location on an AD.

"It's just a phase. He'll grow out of it." Mama, 1964

1956 Chevy 1/2-ton 3100
1953 Chevy 6100 "The Yard dog"
1954 GMC Suburban Now with a new proud owner.