Hi Peter, late reply but you're correct!
Meanwhile, I've been busy this weekend relocating the battery. I wanted to create some space
at the front to accommodate a new fuse/relay box as a part of a rewire project.
I decided to go big and install fuses front and rear, a cut off switch at the rear, and jump
start posts at the front. I used 35mm/240amp cable throughout. All parts from Altec Automotive except the jump posts
which came from Mobile Centre.
The original battery tray was very rusty and had been coated in bitumen, so a replacement from
Chrisc was most appreciated. I made 2 support brackets for the tray. It covers the rear washer
tank, but that is inop anyway, no matter. I ran the cable inside the car, running parallel with
the loom, routing over the rear arch and through the existing hole/grommet that previously
had an air-con hose at the firewall.
Another bracket mounts to the old rear batt tray fixings and holds the jump posts. Another supports
the inline fuse [150amp]
At the rear, an extension bracket behind the tray supports the rear fuse[175amp] and isolator switch.
Various new batt cables made up, fuse to starter motor, earth to jump post, and a couple at the rear.
All soldered and crimped except the lugs on the front to rear cable, maybe a job for another day if I have
the correct tool. [I used my hydraulic press for the loose cables]
Overall, very satisfying and it's tested and working.
I did consider the weight/balance change and felt that it would probably make little difference or...
possibly a slight benefit, time and driving will tell.