Customized version of https://www.thingiverse.com/thing:57281

Created with Customizer! https://www.thingiverse.com/apps/customizer/run?thing_id=57281

Using the following options:

_part = bottom
_batteryDiameter = 10.7
_insideHeight = 30
_columns = 4
_rows = 2
_walls = 0.8
_base = 0.8
_lipHeight = 2
_fitGap = 0.1
_labelText =
_labelFont = write/orbitron.dxf
_labelDepth = -0.3
_labelHeight = 8