Plenty of these around, and there's nothing particularly special about this one.

Mostly I wanted to try out CoffeeSCAD. http://kaosat-dev.github.com/CoffeeSCad

Here's the code.

rows=4 cols=3 size=14.75 innerwall=1.5 outerwall=1.5 base=1.5 height=20

battery= new Cube size : [size,size,50]

body= new Cube size: [((size+innerwall)cols)+(outerwall2)-innerwall,((size+innerwall)rows)+(outerwall2)-innerwall,height]

for x in [0..cols-1] by 1
for y in [0..rows-1] by 1
body=body.subtract(battery.translate([x*(size+innerwall)+outerwall,y*(size+innerwall)+outerwall,base])) return body