The bottom end of Wouxun KG-UV3D battery packs have an intricate set of lugs and ramps:
Those features mate with this set of holes and planes on the bottom of the radio:
Which requires making something like this:
Which attaches to the base of the GPS+Voice case:
Which came out quite nicely:
The trick is to extrude a chunk of the main case shape, then subtract this angular doodad:
Then slice off the angular parts to suit (the purple objects represent volumes that will be subtracted from the gray part):
Most of the heavy lifting happened with that version, but this one fits better…
The Smell of Molten Projects in the Morning 