Battery Box Puzzle - real world puzzle looking for a solution

[Legoman]

I am attempting to arrange a group of 8 battery packs in series within a box. The possible arrangements are in the picture attached as are the rules. If you have any additional questions or a rule is confusing please ask. Hopefully a wire route can be found that doesn't require a single wire to run the full length of a battery but if it does the fewest number and shortest length of these long connections is preferred.

Your help on this problem will be greatly appreciated!!!
Thanks

 

[qqwref]

If you want to start and end in the same empty space, then you must cross every other column in the -> direction the same number of times as you cross it in the <- direction. But the two other columns have three batteries each, and three is odd, so you need to horizontally cross each of those columns a fourth time, using a wire. That makes it so you cross those columns twice <- and twice ->. So given the constraints you should need at least two long connections:

 

[Legoman]

Thanks for the help, I thought that would probably be how it turned out