Forgot to ask
A “Via” is a hole through both layers with a copper core thus joining both layer together at that point. When you place a part (in my case a Wemos D1 Mini) are the pint connects “Via”?
Thanks
Brian
Your part has a number of problems, as shown in this sketch shows. While I could detail the problems, but I suspect you would be better off just unzipping my part and modifying my parts svg files and modify that.
test Sketch.fzz (28.1 KB)
Edit:
Most of the problem appears to be that the mechanical drawing on the web site appears to be wrong about the mounting hole positions and possibly the size. Here is a new copy of the part with the mounting holes changed and your text imported:
battery_holder_dual_18650_new.fzpz (12.8 KB)
Some of the issues in your part:
the pads are too small and likely the wrong size. Typically pads have a 20thou stroke-width (to provide 20 thou pad width) and the hole set to one of the standard drill sizes. The alignment is not on .1in boundaries which is messy looking (since most other parts are.) Somewhere in the forum here there is a post from Steel_Goose on how to do this (I can’t find the actual post right now):
“There is a way to set the drill hole size to 0.035” in Inkscape: First, open the dialog box
“Fill and Stroke”, and click the tab “Stroke style”, set the units to Inches and width to
0.020". Now go the the tool bar and set the units to inches and the width and height to
0.075". Shazam!.. The outside diameter of the circle including the stroke-width minus the
stroke-width x 2… leaves you the inside of the circle (drill size). CorelDraw is a little
different, the toolbar dimensions are the actual dimensions of the circle and the
stroke-width is in a separate window…"
Hopefully the comment on how corel draw does it makes sense to you since you look to be using Corel Draw. I changed the size of the mounting holes to be 0.086in as that is the closest standard drill size to the diameter of your pads.
Try the new part out and see if it works better.
Yes, through hole parts connections are the same as a via assuming the board is made by a company that makes the boards does plated through holes (home etched boards are usually not plated through).
Peter
Hi Peter
Once again thanks for your help. Yes the new part is better, I had played about a bit myself.
Based on what you have said it seem there are “standard” drill hole sizes, I can’t seem to find a list of them, is there one?
With the battery holder I know is a square pin and its about 1.5mm by 1mm, so base on what I have read online this means I need a hole of at least 1.8mm.
This means having a larger pad to solder to as this part is mounted directly onto the PCB (I’m not using the fixing holes to hold it), I’m guessing that if the hole is 1.8mm then the pad has to be at least 2.5mm, plus I have set the tracks from the battery to 100 (although I don’t know what the 100 is, I just need a nice thick track)
Now, I think this the same for Corel and is it for Inkscape, if I draw a circle at 2mm, with a stroke of 1mm, the outside diameter is 2.1mm, and the inside diameter of the circle is only 1.9mm, this is because when drawing a circle you get half the stroke on each side (.05mm) so both side would be 0.1mm, meaning 2mm - 0.1mm = 1.9mm.
So …… if I need a 1.8mm hole and a 2.5mm pad I create a circle of
2.5mm - 1.8mm = 0.7mm (required outside - required inside)
0.7mm / 2 = 0.35mm (half the stroke)
Stroke = 0.35
Circle Size = 1.8mm + 0.35mm = 2.15mm
This gives me a pad size of 2.5mm with a hole of 1.8mm
If the above is correct all I need to know is the standard drill sizes (if there is)
Thanks again
Brian
They are usually obtained from your board house (common sizes are free, odd values are available but usually with an extra tooling charge for mounting the non standard drills. I use this one from AP Circuits
Free sizes:
.0197
.0280
.0350 ic pins
.0380 .25 connector posts
.0420 1n4001 diode holes
.0520
.0595
.0860
.1250
.1520
the ones with text are what the Fritzing parts factory amd/or core parts use for the listed part. As far as I know they aren’t documented anywhere except the source code. Your best bet for drill sizes is to check with who is going to make your boards, or if you are doing it yourself what drill sizes you have. Your calculation looks right but the best way to check is to export the gerber files then edit the drill.txt file which will tell you what drill sizes are being called for, you can check the pad size in a gerber viewer such as gerbv (it has a measurement function).
Peter
1 Like
Hello,
Is there a part for SINGLE 18650 battery holder ?
Thanks in advance.
Regards,
Yes, in general a google search for “fritzing part 18650 battery holder” will find parts, in this case (since I made it) I know it is in the forums and the forum search bar finds it:
Peter
Awesome thanks. I did search in forums and it only resulted in the dual holder design. anyways thanks.
do you happen to have the triple version?
No, but if you have a web site with what you want it is easy enough to make one.
Peter
Just my 2c for others looking to get 18650 holders: Get the battery first and measure it’s length, since some manufacturers will add protection chip on top of 18650 battery, which makes it 2-3mm longer, which is just a bit to much so you can’t fit it into standard 18650 holder.
Hi, vanepp, you’re really help me a lot by your github Fritzing files. Especially for the parallel 18650 Battery Fritzing parts.
I’m currious, is it possible to get just a single cell 18650 battery? I already get 7.4 Volt 18650 Battery visualization from your github. Now I only need 3.7 Volt 18650 Battery visualization.
Thanks in advance.
Soon, I’ll learn how to create Fritzing parts when I have enough internet quota to watch tutorials that created by Old_Grey.
Post 11 above is a single 18650 battery holder. A google search of the form “fritzing part 18650 battery holder” will also turn it up.
Peter
Oh, I already downloaded and open that file before asking my previously request,
actually what I’m looking is battery cells visualization as similar as you use in the battery_holder_dual_18650 you provide in Post 4 above. brown and black color battery, with same “18650 battery” text.
I’d prefer using similarity in every sketch because I’m teaching 7 years old kids, so with same visualization, it will keep them away from confusion, 
no problem if you not have time to provide it, I really need learn how to create these fritzing parts by myself later,
Anyway, thanks again for your reply, I’m appreciate your time and effort, 
Ajie
Ah, that makes sense. A lot easier for me to do than you I expect (part making is fairly complex!) Here is a part that has the breadboard image from the dual part.
18650-battery-holder-alt.fzpz (5.8 KB)
A note of caution (which you already may be aware of!), LIPO batteries can either catch fire or explode if shorted. So if your students are using actual batteries, you may want to make sure you have cells with overload protectors in them. The usual 18650 cells do not have overload protectors although apparently some cells do now!
Peter
Eh, I’m really sorry, this must be really bother you, I should attach image first about what I need, 
below is a wiring diagram for my lesson about Basic DC Motor, in this second lesson, i’ll explain and show effects to motor speed and torque if we use two 18650 Battery in parallel, of course the motor speed and torque will sums up,
and for the first lesson about Basic DC Motor, I want to explain to them what happens if we use one 18650 Battery only, but I’m out of parts for single cell 18650 Battery for create Wiring Diagram,
I’m planning using same battery color as part 2 in this Wiring Diagram below (which is the Battery Fritzing parts files is from you too), the Wiring Diagram will looks like this,
I can use your latest 18650-battery-holder-alt files that you provide previously, but it will make the kids little confused and questioning “why they’re in different colors??”
and maybe you want to add some plus minus symbols in the battery parts like the AA Battery,
so they can recognize and easily remember about battery polarity information,
I’m sorry for being choosy person 
I have to do this because based on my experience, kids should not be stressed out while learning about electronics and robotics, even when learning about Wiring Diagram in very early age,
ah, thanks so much again for your cautions note, I’ll explain about it to them first for keep the 18650 Battery not touching its each other polarity, (maybe with some little sparks show, so they’ll afraid and became very carefull then )
Ajie
If you can upload the Fritzing part for the dual battery holder (as I don’t have a copy of that one!) I will modify the alt part to match it.
Peter
Here is a single battery holder created from the dual part found earlier in this thread. It matches your “1” in the image. You can use this for visualization of any number of batteries by adding the right number of copies. Here is a sketch with a single battery, 2 in parallel, and 2 in series, with the breadboard view setup to “look” like it is using dual battery holders. My version of the battery part is available here, as well as the sketch the image was taken from. The battery holder will also be in the “tmp” bin for the sketch.
1x_18650_battery_holder_1.fzpz (4.2 KB)
battery_and_motor.fzz (9.8 KB)
Hi everyone,
Just so happens I need an 18650 battery holder.
I tweaked the breadboard view image of vanepp’s battery-holder-alt file posted above.
Here’s the file:
18650 battery holder_mod.fzpz (7.7 KB)
If you want any other parts posted in this thread adjusted to look like this one, just let me know…
Randy
Hi, Randy,
Thanks so much, this is what I looking for, its have plus and minus symbols now, kids will easily recognize it which is positive and negative polarity then,
If this not bother you, may I request it in 2 cells, 3 cells, and 4 cells 18650 battery in series visualitzation files too?? just in case in near future, we will use bigger power for bigger projects,
I’ll put this files here, I’m hoping it will have similar output like this one (little red and black cables), but this one is lack with plus minus symbols in battery’s body for mark its polarity,
Battery.fzpz (10.6 KB)
I use Battery.fzpz files above because I’m use this part below in real life:
the Battery Holder has similar output visualization too in Battery.fzpz files,
for me, its important to have similar or almost same visualization in Wiring Diagram to real life components I use for teaching 7 y.o kids, I hope you understand why I’m being choosy person here,
Thanks in advance,
Ajie,