I got the urge to make a battery connector that fits on my Ryobi or Parkside power tool batteries.
Thingiverse had lots of designs, but they all seemed quite complicated and would have taken a while to print, so I designed super minimalist versions that print in less than 15 minutes.
For both battery connectors the contacts are standard male spade-crimps. It was the easiest way to get a plated copper contact, and it turned out that they are a good fit in both designs.
The current rating should be good, but don't push things too far. An inline fuse is a good option if there is a risk of the powered device short circuiting.
The Parkside batteries are sold by Lidl, but may be available as a different brand outside Europe. Note that some battery packs do not have internal overdischarge protection, so care should be taken to avoid discharging the packs below around 3V per cell. For an 18/20V pack that's usually around 15V.
The Ryobi one is ugly but functional. I may revisit the design later to add a cup for gluing the terminals in more neatly.
The scripts are down below. Copy and paste them into openscad to create your STL files or use them as a base for your own version.
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Here's the Parkside openscad script:-
//Parkside battery mini adaptor
//Use with two male spade crimps
difference(){
union(){
//main block
cube([46,20,10]);
}
//side slides
translate([-1,5,5])
cube([6,21,6]);
translate([41,5,5])
cube([6,21,6]);
translate([4,5,-1])
cube([3.5,20,12]);
translate([38.5,5,-1])
cube([3.5,20,12]);
//Terminal cutouts
translate([8.5,1,1])
cube([6,18,10]);
translate([31.5,1,1])
cube([6,18,10]);
//terminal slots
translate([10.5,17,1])
cube([2,10,10]);
translate([33.5,17,1])
cube([2,10,10]);
//cable slots
translate([10,-1,4])
cube([3,10,10]);
translate([33,-1,4])
cube([3,10,10]);
//plastic and time saver
translate([15.5,1,1])
cube([15,18,10]);
}
Here's the Ryobi openscad script:-
//Ryobi adaptor
$fn=50;
height=20;
difference(){
union(){
//main block
cylinder(h=height,d=29);
translate([-14.5,0,0])
cube([29,20.5,height]);
}
//battery recess
translate([0,0,1])
cylinder(h=height,d=27);
translate([-13.5,0,1])
cube([27,19.5,height]);
//terminal slots
translate([-12.5,3.5,-1])
cube([2,7,5]);
translate([10.5,3.5,-1])
cube([2,7,5]);
//polarity markings
translate([-7,6.5,-1])
cube([5,1,5]);
translate([4,4.5,-1])
cube([1,5,5]);
translate([2,6.5,-1])
cube([5,1,5]);
}
//Pressure plates
translate([-14.5,3.5,0])
cube([2,7,14]);
translate([12.5,3.5,0])
cube([2,7,14]);
