diff --git a/carlson_amp_enclosure.py b/carlson_amp_enclosure.py
index c139869..0cc7252 100644
--- a/carlson_amp_enclosure.py
+++ b/carlson_amp_enclosure.py
@@ -35,19 +35,24 @@ hole_radius = hole_diameter / 2.0
 
 box_width = 65.0
 box_height = 30.0
-box_length = 100.0
+box_length = 120.0
 wall_thickness = 2.0
 
 battery_holder_width = 62.67
 battery_holder_length = 57.36
 battery_holder_height = 15.83
 battery_holder_hole_dist = (
-    14.76  # distance between the centers of the countersunk holes
+    15.57  # distance between the centers of the countersunk holes
 )
-battery_holer_hole_dist_from_side = (
-    8.39  # distance from side to middle of the first hole
+
+battery_holder_slot_dist_from_holes = (
+    25.4  # How far away the fitting slot is from the screw holes
 )
 
+battery_holder_slot_length = 52.0
+battery_holder_slot_width = 2.1
+battery_holder_screw_radius = 6.37 / 2.0
+
 result = (
     Workplane()
     .box(box_length, box_width, box_height)
@@ -88,19 +93,63 @@ bottom = bottom.workplane(offset=box_height + 5).box(
 )
 
 bottom = (
-    bottom.workplane(offset=(box_height / 2) - 10)
+    bottom.workplane(offset=(box_height / 2) - 9)
     .rect(box_length - 5.5, box_width - 5.5)
     .vertices()
     .cylinder(box_height - wall_thickness * 1.5, 2.5)
 )
 
 bottom = (
-    bottom.workplane(offset=(box_height / 2) + 3.0)
+    bottom.workplane(offset=(box_height / 2) + 4.0)
     .rect(box_length - 5.5, box_width - 5.5)
     .vertices()
     .threadedHole(top_screw, 10, simple=screw_simple, fit="Close", counterSunk=False)
 )
 
+bottom = (
+    bottom.workplane(offset=-(box_height / 2.0) + 8.9)
+    .move(box_length / 2.0 - wall_thickness * 4, 0)
+    .box(battery_holder_slot_width, battery_holder_slot_length, 4.0)
+)
+
+bottom = (
+    bottom.workplane(offset=-(box_height / 2.0) + 9.0)
+    .move(
+        (box_length / 2.0 - wall_thickness * 4) - 24.0,
+        -(battery_holder_slot_length / 6.5),
+    )
+    .vLine(battery_holder_hole_dist)
+    .vertices()
+    .cylinder(4, battery_holder_screw_radius)
+    .workplane(offset=-(box_height / 2.0) + 11.10)
+    .move(
+        (box_length / 2.0 - wall_thickness * 4) - 24.0,
+        -(battery_holder_slot_length / 6.5),
+    )
+    .vLine(battery_holder_hole_dist)
+    .vertices()
+    .threadedHole(top_screw, 2.0, simple=screw_simple, fit="Close", counterSunk=False)
+)
+0
+bottom = (
+    bottom.workplane(offset=-(box_height / 2.0) + 9.0)
+    .move(
+        (box_length / 2.0 - wall_thickness * 4) - 24.0,
+        (battery_holder_hole_dist * 2) - 8,
+    )
+    .vLine(-(battery_holder_hole_dist * 3))
+    .vertices()
+    .cylinder(4, battery_holder_screw_radius)
+    .workplane(offset=-(box_height / 2.0) + 11.10)
+    .move(
+        (box_length / 2.0 - wall_thickness * 4) - 24.0,
+        (battery_holder_hole_dist * 2) - 8,
+    )
+    .vLine(-(battery_holder_hole_dist * 3))
+    .vertices()
+    .threadedHole(top_screw, 2.0, simple=screw_simple, fit="Close", counterSunk=False)
+)
+
 cq.exporters.export(bottom, "/home/deck/model_files/carlon_probe_amp_enclosure_box.stl")
 cq.exporters.export(top, "/home/deck/model_files/carlon_probe_amp_enclosure_lid.stl")