Trunk mounted batteries, worth the effort, expense or weight?

[65_LS1_T56]

Seems like everyone mounts the battery in the trunk for weight balance issues.

The way I look at it is, how much weight to you add to help balance? With the Lithium batteries now, wouldn't it make more sense to just leave them up front with shorter cables? How much do the cables alone going to the trunk add in weight? Just thinking.

The Braile batteries are like 21 pounds compared to a 45+ Optima.
Anyone have experience with the Braile battery in a daily driver? Just wondering everyone's thoughts.
I found these: Braile mounts that are lightweight and look pretty cool. Battery and mount, you have to be 25+ pounds lighter, not to mention all of the cabling!
I'm at that point to start thinking about this as I'll be wiring soon.