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Ultimate 18650 Power Bank with Infinitely Expandable Capacity

by Mrkplayer May 29, 2019
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Thanks for sharing great work!!

Is there any reason not using ABS for all parts??

It ok to modify for me to use VRUZEND caps?

For those who want to start this project, check out my remix. It makes the process of ordering and building easier, as I'm adding as much information about it along the way as I build the powerbank.
I'm doing this because it is a project that I find very interesting, and because I struggled myself in the beginning to find all the needed informations.
Thank you Mrkplayer for sharing this with everybody!

I started putting this together tonight and immediately ran into issues. The battery "cap" did not sit flush with the top of the batteries once I slid the BMS in place. The only way I could get the top of the battery holder to sit flush with the batteries was if I cut the BMS holder tabs, and even then it is slightly larger than the battery pack itself dimensionally. I purchased the listed BMS and listed batteries, any idea what is going on or is this normal?

I had no issues fitting the BMS. Maybe they are selling a slightly larger one now. Mine is 56mm long and 45mm wide. I don't think that you need the holder tabs, as the BMS is held in place once you solder the copper strips. You can even cut a small groove in the XT60 connector holder, as there will be nothing there.
I remember seeing BMS boards that were slightly longer, but the end could be cut off in my opinion. If you send me a picture of yours I can check it out.

Thanks for your response, this is exactly what it was! The end of the board has a part that almost looks like it is meant to be broken off? Broke off easily with pliers and fit perfectly in front of the battery pack in the slots. Thank you!

Thanks for your response, this is exactly what it was! The end of the board has a part that almost looks like it is meant to be broken off? Broke off easily with pliers and fit perfectly in front of the battery pack in the slots. Thank you!

I placed an order for most of the parts last night, I am excited for the build but the youtube video is misleading. No way you're spending under $60 for the parts. Not only that, but many parts are missing from the youtube description that I had find myself. I'm about $130 in right now, after plastic and other misc items that I'm sure will come up the total will most likely be around $150. This is not including other things that I already have on hand like wire, solder, soldering iron, printer, electricity for the 70-100 hour print time, etcetc. I would just appreciate a bit more honesty. Great design nonetheless, thank you.

There are quite a few parts missing from the youtube description. I managed to find most on aliexpress or eBay, but I am a bit confused on which "Copper Strip" and "hinge" you used. Could you please provide a direct link to these?

If you can't find the hinge, I remixed the model and it includes a Pull Tab that can be printed in flexible material. I could not find a hinge myself, so this replaces it.

I got both of them at Home Depot. 0.5mm thick copper foil, the hinge measures 0.5x0.75in. You can also use 0.3mmx8mm nickel strips.

What are the numbers for besides the files? I thought maybe for the number of parts of that kind but then it wouldn't make sense to have two outer shells.

I don't know what they are supposed to mean, but I remixed the model with a reworked naming scheme that is much clearer. There is just one part that you have to print two times.

can you do a 2 part outer shell stl files? Most people cannot print this height.

I remixed the model with oriented parts and the outer shell cut. Go check it out

for people who have dual color printers, could you possibly include stls to print all the text parts without a color swap mid print?

Brilliant work Kennedy

Assembly file has a full of unresolved and wrongly pointed files in the tree. You should use Solidworks pack-and-go feature for sharing.

The post is now updated with Pack and go Zip file. There should be little to no error in the assembly now.

Super, I think very hard that I wil build this very soon. But just change the frontface to an Euro-plug ;)

Do you also have a solution to mount the 230V inverter ? How can I mount the EU plug instead of the US outlet plug ?

Sadly, due to size constraints, you might need us to eu adapter.

Where can I buy the parts to build this?

Go to the YouTube video description, all the part links and schematics are there.