The FA that will push/pull the track cleaner is done with 14.8V, 5,200mA Li-poly cells.
The guts secured inplace:
Track/battery/primary charge jack wiring:
I made an extension for the 5-pin plug using an old plug, its wiring and board header from an old VCR. This is how I ran the "cell wiring" for the balance feature out through the lower box side:
And the adapter for the "power plug" connected to the charger.
Now if we could just tuck that 5-pin plug in someplace inconspicuous... This required a bit of trimming on the curved edge of the air cylinder but it is not noticable.
... With easy access:
Voila!