The wooden panel in the top box serves two purposes.[list=1][*]It is the master power panel with switches, charging posts, auto-style (cigarette) port for my power inverter, voltmeter, and wiring harness.[*]It also contains a switched fan to cool my eFlight and other battery backs that slide underneath[/list=1]
The following picture lays out details and can be clicked on for a larger view...


The white box in the lower bin contains the charging station for the field box battery cell. The charging station contains special circuitry that will peak and monitor the battery condition to keep it fully charged without over charging it. I can charge the field box battery both from a 110v AC source as well as a 12v DC source while traveling.
The following picture shows whats inside the white box.


If you get a chance, check out the web-pages I have created that detail the construction of my field box. You can find them by CLICKING HERE

Thanks for looking and I appreciate the input.