It's not needed but it doesn't hurt if you still install it. It just reduces the voltage a tad lower. I'm not a fan of those dowels, but that's one way to do it if you don't want to do any soldering.
Here's my video on installing a remote battery holder:
http://pinballhelp.com/how-to-add-a-remote-battery-holder-to-your-pinball-machine/
And here's my video on replacing batteries with a memory capacitor (which works especially well on Bally-35s):
http://pinballhelp.com/how-to-install-a-memory-capacitor-to-replace-a-battery-pack/

Anyone got anything like this for a Bally 6803?

pinball2.jpg

I meant more along the lines of, anyone got any instructions specific to this model hehe, not anyone crazy enough to still have the old batteries in.