Battery relocation for HANDLING (not drag) - best spot to mount?

How much did it change when you moved the battery to the trunk?

i didn’t move it to the trunk.

I’m actually thinking of moving under or behind the passenger rear seat. Or under passenger seat.

thinking of a lightweight battery like in the 10-15 lbs range.

or maybe something like this at 3.8 lbs:
(LI) Antigravity ATX-20 RS 12v Lithium Battery, 680 CA | Pegasus Auto Racing Supplies

Current battery weighs 42.1 lbs by the specs