From 986f7c7b3d433d9a61012881d14a49e6c55ec06f Mon Sep 17 00:00:00 2001
From: Bdale Garbee <bdale@gag.com>
Date: Thu, 12 Jun 2025 13:24:17 -0600
Subject: [PATCH] battery holder for 3 pieces 18650

---
 packages/.gitignore |   1 +
 packages/18650x3.py | 131 ++++++++++++++++++++++++++++++++++++++++++++
 packages/Makefile   |   3 +-
 3 files changed, 134 insertions(+), 1 deletion(-)
 create mode 100755 packages/18650x3.py

diff --git a/packages/.gitignore b/packages/.gitignore
index a0d84ac..5b22604 100644
--- a/packages/.gitignore
+++ b/packages/.gitignore
@@ -170,3 +170,4 @@ XLR3.fp
 XLR4.fp
 XLR5.fp
 sj-63033a.fp
+18650x3.fp
diff --git a/packages/18650x3.py b/packages/18650x3.py
new file mode 100755
index 0000000..4720fa4
--- /dev/null
+++ b/packages/18650x3.py
@@ -0,0 +1,131 @@
+#!/usr/bin/python3
+# Copyright 2025 by Bdale Garbee <bdale@gag.com>.  GPLv3
+#
+# Program to emit PCB footprint for 3x 18650 battery holder
+#
+
+# dimensions in mm from AliExpress seller page and direct measurement
+BodyX = 60.0
+BodyY = 77.0
+
+PinSpacing = 72.0
+RowSpacing = 19.0
+
+Drill = 1.75		# diameter of drill hole
+Thickness = 2.75	# outer diameter of copper annulus
+Clearance = 1		# delta in diameter above Thickness for plane clearance
+Mask = 2.9		# mask opening diameter 
+
+SilkWidth = 10	# in units of 1/1000 inch 
+SilkNative = SilkWidth * 100 
+
+import sys
+
+# we're going to use the 1/100 of a mil fundamental unit form
+def mm2mils100( mm ):
+	return int( mm / 25.4 * 1000.0 * 100.0 + 0.5 )
+
+print('# author: Bdale Garbee')
+print('# email: bdale@gag.com')
+print('# dist-license: GPL 3')
+print('# use-license: unlimited')
+
+print('Element[0x0 "1MS1T1B4M7" "" "" 0 0 0 0 0 100 0x0]')
+print("(")
+print('   Pin[',\
+ 	mm2mils100(-RowSpacing), \
+ 	mm2mils100(-PinSpacing/2), \
+ 	mm2mils100(Thickness), \
+	mm2mils100(Clearance), \
+	mm2mils100(Mask), \
+	mm2mils100(Drill), \
+	'"pin1" "1" 0x0101]')
+
+print('   Pin[',\
+ 	mm2mils100(-RowSpacing), \
+ 	mm2mils100(PinSpacing/2), \
+ 	mm2mils100(Thickness), \
+	mm2mils100(Clearance), \
+	mm2mils100(Mask), \
+	mm2mils100(Drill), \
+	'"pin2" "2" 0x0001]')
+
+print('   Pin[',\
+ 	0, \
+ 	mm2mils100(-PinSpacing/2), \
+ 	mm2mils100(Thickness), \
+	mm2mils100(Clearance), \
+	mm2mils100(Mask), \
+	mm2mils100(Drill), \
+	'"pin3" "3" 0x0001]')
+
+print('   Pin[',\
+ 	0, \
+ 	mm2mils100(PinSpacing/2), \
+ 	mm2mils100(Thickness), \
+	mm2mils100(Clearance), \
+	mm2mils100(Mask), \
+	mm2mils100(Drill), \
+	'"pin4" "4" 0x0001]')
+
+print('   Pin[',\
+ 	mm2mils100(RowSpacing), \
+ 	mm2mils100(-PinSpacing/2), \
+ 	mm2mils100(Thickness), \
+	mm2mils100(Clearance), \
+	mm2mils100(Mask), \
+	mm2mils100(Drill), \
+	'"pin5" "5" 0x0001]')
+
+print('   Pin[',\
+ 	mm2mils100(RowSpacing), \
+ 	mm2mils100(PinSpacing/2), \
+ 	mm2mils100(Thickness), \
+	mm2mils100(Clearance), \
+	mm2mils100(Mask), \
+	mm2mils100(Drill), \
+	'"pin6" "6" 0x0001]')
+
+print('   ElementLine[',\
+        mm2mils100(-BodyX/2), \
+        mm2mils100(-BodyY/2), \
+        mm2mils100(-BodyX/2), \
+        mm2mils100(BodyY/2), \
+        SilkNative, ']')
+
+print('   ElementLine[',\
+        mm2mils100(-BodyX/2), \
+        mm2mils100(-BodyY/2), \
+        mm2mils100(BodyX/2), \
+        mm2mils100(-BodyY/2), \
+        SilkNative, ']')
+
+print('   ElementLine[',\
+        mm2mils100(BodyX/2), \
+        mm2mils100(-BodyY/2), \
+        mm2mils100(BodyX/2), \
+        mm2mils100(BodyY/2), \
+        SilkNative, ']')
+
+print('   ElementLine[',\
+        mm2mils100(-BodyX/2), \
+        mm2mils100(BodyY/2), \
+        mm2mils100(BodyX/2), \
+        mm2mils100(BodyY/2), \
+        SilkNative, ']')
+
+print('   ElementLine[',\
+        mm2mils100(-BodyX/15), \
+        mm2mils100(-BodyY/2.75), \
+        mm2mils100(BodyX/15), \
+        mm2mils100(-BodyY/2.75), \
+        2*SilkNative, ']')
+
+print('   ElementLine[',\
+        0, \
+        mm2mils100(-BodyY/2.75-BodyX/15), \
+        0, \
+        mm2mils100(-BodyY/2.75+BodyX/15), \
+        2*SilkNative, ']')
+
+print(")")
diff --git a/packages/Makefile b/packages/Makefile
index f9f505d..f46ef76 100644
--- a/packages/Makefile
+++ b/packages/Makefile
@@ -185,7 +185,8 @@ FOOTPRINTS= \
 	XLR3.fp \
 	XLR4.fp \
 	XLR5.fp \
-	sj-63033a.fp
+	sj-63033a.fp \
+	18650x3.fp
 
 .5c.fp:
 	nickle $*.5c -o $@
-- 
2.47.2