Search found 987 matches

by rojitor
Oct 04 2019 6:29pm
Forum: Items for Sale - New
Topic: CHEAP NEW ORIGINAL CELLS LI-ION 18650
Replies: 787
Views: 196660

Re: CHEAP NEW ORIGINAL CELLS LI-ION 18650

I said nothing...
by rojitor
Jul 28 2019 5:50am
Forum: Battery Technology
Topic: BOSS LEVEL CUSTOM SPOT WELDER
Replies: 438
Views: 43337

Re: BOSS LEVEL CUSTOM SPOT WELDER

kjhmWXenyTE I did this video for another forum yet it's interesting here too. Order matters: 1st I tested copper on steel and nickel on it. Good results as usual 2nd I did copper on nickel. Not very good yet acceptable. 3rd nickel on copper. Very good. As you can see the order matters. Copper on ni...
by rojitor
Jun 20 2019 12:46pm
Forum: Battery Technology
Topic: BOSS LEVEL CUSTOM SPOT WELDER
Replies: 438
Views: 43337

Re: BOSS LEVEL CUSTOM SPOT WELDER

Mostly yes. Fets will die eventually but heat is what will kill them fast. If you keep the machine cold you are good for next weld.
by rojitor
Jun 17 2019 5:08am
Forum: Battery Technology
Topic: BOSS LEVEL CUSTOM SPOT WELDER
Replies: 438
Views: 43337

Re: BOSS LEVEL CUSTOM SPOT WELDER

Good morning. For those who have difficulties with the pen maintenance and building new ones you will be glad to know that the sunkko is discounted now. https://s.click.aliexpress.com/e/cmVje588 Just solder an xt90 and ready to go. The tips are extremely expensive but I think you should be able to m...
by rojitor
Jun 14 2019 2:12pm
Forum: Battery Technology
Topic: BOSS LEVEL CUSTOM SPOT WELDER
Replies: 438
Views: 43337

Re: BOSS LEVEL CUSTOM SPOT WELDER

Today i made another sandwich method test with the custom boss spot welder. I am very happy with the results. Copper on copper sucks. I have never managed to make a decent weld. They do not stick. Using the sandwich method i made two strips of copper with nickel inside stick and two strips of nickel...
by rojitor
Jun 13 2019 3:52pm
Forum: Stand-up E-scooters and E-skateboards
Topic: Building a dangerous deck
Replies: 3
Views: 427

Re: Building a dangerous deck

https://eu.nkon.nl/catalogsearch/result/?q=Vtc5a If you are outside EU use .ru site Maybe Michal (tumich) from this forum has them refurbished. The common charge for li ion is 0.5c 10s4p 30q= 12ah good up to 6amps charger 10s4p vtc5a=10.4ah good up to 5 amps charger You can fully charge in 2 hours....
by rojitor
Jun 12 2019 5:33pm
Forum: Stand-up E-scooters and E-skateboards
Topic: Building a dangerous deck
Replies: 3
Views: 427

Re: Building a dangerous deck

If you plan to make just one battery you better buy a commercial one. If you want to learn how to do it arduino spot welders are good for that task. Best bang for the buck is Samsung 30q right now. If you want more quality Sony vtc5a have a great price. Use a good bms. I use smart bms lately. You ca...
by rojitor
Jun 12 2019 5:00pm
Forum: Stand-up E-scooters and E-skateboards
Topic: Is An Electric Short Board Worth The Portability?
Replies: 6
Views: 398

Re: Is An Electric Short Board Worth The Portability?

Short boards are not uncomfortable at all. They turn much better at narrow streets, they have often a kicktail making your life easier.... they are not as stable at high speeds as a longboard and the stance is not optimal for long rides(my personal opinion not the absolute truth). Depending on the k...
by rojitor
Jun 12 2019 2:43pm
Forum: Stand-up E-scooters and E-skateboards
Topic: Is An Electric Short Board Worth The Portability?
Replies: 6
Views: 398

Re: Is An Electric Short Board Worth The Portability?

That depends entirely on your own taste. I have a short deck for small trips to the pharmacy or groceries and I love it. When I go "for a ride" I prefer longboard. They are the same concept yet they have nothing to do... make your choice: comfort or portability. If you got the cash pick both....
by rojitor
Jun 08 2019 11:26am
Forum: Battery Technology
Topic: BOSS LEVEL CUSTOM SPOT WELDER
Replies: 438
Views: 43337

Re: BOSS LEVEL CUSTOM SPOT WELDER

I just did another pack. Same method, 0.1 copper sheet+neodinium 12s4p with sony konions vtc4+120amps bms inside a waterproof pelican case. 3.2 kg of pure powah for a trampa e-mtb
20190608_170742.jpg
20190608_175059.jpg

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20190608_175410.jpg
by rojitor
Jun 07 2019 4:23am
Forum: E-Scooter and Motorcycle General Discussion
Topic: The Easy way to mount a tire to a hub motor
Replies: 11
Views: 760

Re: The Easy way to mount a tire to a hub motor

nice method. I think i will eventually try it. thanks for sharing
by rojitor
Jun 07 2019 12:54am
Forum: Battery Technology
Topic: BOSS LEVEL CUSTOM SPOT WELDER
Replies: 438
Views: 43337

Re: BOSS LEVEL CUSTOM SPOT WELDER

My only concern is: are 0.1 copper sheath strong enough not to sheer off un stress and vibrations ? I used 0.127 mm copper sheets to do a pack (god forbid, I soldered it), but it's holding off real well. Pics of mine: https://endless-sphere.com/forums/viewtopic.php?f=2&t=93576&p=1429947&hilit=Anche...
by rojitor
Jun 07 2019 12:49am
Forum: Battery Technology
Topic: BOSS LEVEL CUSTOM SPOT WELDER
Replies: 438
Views: 43337

Re: BOSS LEVEL CUSTOM SPOT WELDER

What thickness of copper sheet are you using? What size and N-rating of magnet are you using? (link?) That pack has 0.1 pure copper. The magnets are these: https://s.click.aliexpress.com/e/bXeMJ9ZO The pack has been tested under rough conditions. Very intense vibrations and shocks. So far so good. ...
by rojitor
Jun 06 2019 2:56pm
Forum: Battery Technology
Topic: MiniSpotA spot welder
Replies: 51
Views: 4059

Re: MiniSpotA spot welder

Going back to the discussion of sandwich spot welding, I have tested this method to weld copper with the MiniA VTtL6Q_ON7U 0.05 sandwich test.jpg The scraps at the left are the aftermath of the sandwich method. At the right is a direct spt weld on copper. Direct is far superior with this machine. No...
by rojitor
Jun 06 2019 2:46pm
Forum: Battery Technology
Topic: BOSS LEVEL CUSTOM SPOT WELDER
Replies: 438
Views: 43337

Re: BOSS LEVEL CUSTOM SPOT WELDER

I have tested the sandwich method with the boss welder today.


0.1 sandwich test.jpg
Left is sandwich method and right is direct spot weld.
I guess that method is good for machines unable to weld copper but not for the boss welder.
Direct is far superior with this machine.
by rojitor
Jun 06 2019 1:12pm
Forum: Battery Technology
Topic: MiniSpotA spot welder
Replies: 51
Views: 4059

Re: MiniSpotA spot welder

Ok enaon:
The pieces of wood are 25mm X 125mm they are kind of 20mm deep.
by rojitor
Jun 03 2019 4:45am
Forum: Battery Technology
Topic: BOSS LEVEL CUSTOM SPOT WELDER
Replies: 438
Views: 43337

Re: BOSS LEVEL CUSTOM SPOT WELDER

I did this weekend a shockproof pack for a Trampa mountainboard. My customer is more of an animal than a human so it really needs to be rock solid to last in his hands. I used both welding and the neodinium magnets technique. The welds are really really unlikely to fail due to vibrations and continu...
by rojitor
Jun 03 2019 3:25am
Forum: Battery Technology
Topic: MiniSpotA spot welder
Replies: 51
Views: 4059

Re: MiniSpotA spot welder

i'll try to do it when i get home. I'm out now.
by rojitor
Jun 03 2019 2:56am
Forum: Battery Technology
Topic: BOSS LEVEL CUSTOM SPOT WELDER
Replies: 438
Views: 43337

Re: BOSS LEVEL CUSTOM SPOT WELDER

It is way more difficult to cool. You must go slower.
It makes fine welds on 0.05 copper at 4-5ms
I just did a flat pack for esk8. Check it's thread:
https://endless-sphere.com/forums/view ... t=98854
by rojitor
May 28 2019 1:24am
Forum: Battery Technology
Topic: MiniSpotA spot welder
Replies: 51
Views: 4059

Re: MiniSpotA spot welder

I just did a semiflex flat battery pack with the MiniA. 0.05 copper. The conductivity is similar to 0.2 nickel but copper has better heat disipation and flexibility. The risk of failure due to vibrations is minimal. 1.jpeg 2.jpeg 3.jpeg 4.jpeg 5.jpeg 6.jpeg The MiniA did a great job. I managed to ma...
by rojitor
May 20 2019 5:40am
Forum: Battery Technology
Topic: MiniSpotA spot welder
Replies: 51
Views: 4059

Re: MiniSpotA spot welder

You did a nice job on that ninebot. :wink:
by rojitor
May 19 2019 8:17am
Forum: Battery Technology
Topic: BOSS LEVEL CUSTOM SPOT WELDER
Replies: 438
Views: 43337

Re: BOSS LEVEL CUSTOM SPOT WELDER

@ rojitor , can you give me a supply of the 99.9 copper you got there in 1.5mm or other ? I made a lot of copper packs lately. Actually I am running out of it. You can weld 0.1mm with the boss...I do not recommend above that. I source copper here: https://www.ebay.es/itm/Kupferblech-Kupferfolie-Kup...
by rojitor
May 19 2019 8:10am
Forum: Battery Technology
Topic: BOSS LEVEL CUSTOM SPOT WELDER
Replies: 438
Views: 43337

Re: BOSS LEVEL CUSTOM SPOT WELDER

KenC wrote:
May 19 2019 3:29am

Has anyone took the effort to box it? Would love to learn how you do it. I am totally clueless how to go about it.
Just make an adaptor for a 3s lipo brick and you are ready to solder off the grid. I did some field jobs with it. I did over 30" with 5000mah
by rojitor
Apr 15 2019 2:00pm
Forum: Battery Technology
Topic: BOSS LEVEL CUSTOM SPOT WELDER
Replies: 438
Views: 43337

Re: BOSS LEVEL CUSTOM SPOT WELDER

If memory serves me right it's rated for 800 amps(3s)
This is the datasheet of the fets: https://www.google.com/url?sa=t&source= ... zozDZkkxng
by rojitor
Apr 15 2019 1:28pm
Forum: Battery Technology
Topic: BOSS LEVEL CUSTOM SPOT WELDER
Replies: 438
Views: 43337

Re: BOSS LEVEL CUSTOM SPOT WELDER

Do you mean the lipo to power the welder?
I have tested up to 6s. Above 4s It is dangerous. You can damage the fets.