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Electric Stunt => Gettin all AMP'ed up! => Topic started by: Dennis Nunes on April 02, 2025, 06:48:06 PM
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Another new experience...
This time I put together another article on how I made my own lithium-ion battery packs. It was quite an adventure. The article is entitled "So You Want to Make Lithium-Ion Battery Packs?"
You can download the article from the Flying Lines website. I hope you enjoy it.
http://flyinglines.org/Making.a.Li-Ion.Battery.Pack.pdf (http://flyinglines.org/Making.a.Li-Ion.Battery.Pack.pdf)
Thanks to John Thompson for posting this on the Flying Lines website.
Dennis
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Good stuff....thanks for posting Dennis!
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Good stuff Dennis. I just ordered the spot welder and some nickel strip! I just got some P30B's in just the other day. Your article was very timely. I used to solder my packs but I thought I'd try the spot welder this time.
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I used to solder my packs but I thought I'd try the spot welder this time.
Thanks Crist. Once you start using the spot welder you'll never go back to soldering! ;D
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Nicely done!
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Dennis,
Just to be sure you used .2mm x 8mm nickel strips? The specs on the welder says that it is not for .2mm strips. Can you elaborate?
Thanks.
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Just to be sure you used .2mm x 8mm nickel strips? The specs on the welder says that it is not for .2mm strips. Can you elaborate?
Yes I use the .2mm x 8mm nickel strips. In looking over the specs on the welder, you are correct!
Interestingly, on a recommendation the first spot welder I ordered a Kerpu 5000 mAh unit. I didn't look at the specs and just blindly order it. This DID NOT work with .2mm strips. In fact, it didn't work with very well with .15mm nickel strips! I tried welding two .15mm and two .2mm strips together I could peel the strips off apart my fingers very easily. Very little penetration to no penetration when used on the highest setting. I ended up returning this unit and ordered the Seesii 11000 mAh unit.
When I order my current unit, I could have sworn it stated it would work with .2mm strips. But I just looked on the Amazon site and at the box that my Seesii 11000 mAh came in and the Product Information clearly states the recommended thickness of 0.1-0.15mm (not for .2mm strips).
When I received my unit, I did the two .2mm strip test again, at the lower setting, the penetration was ok, but not to my liking. When I changed to the highest setting (eight), it not only welded the strips together, but put a nice burn mark on the piece of wood that I placed the strips on for welding. I could not pull the strips apart with my fingers, I had to take pliers on each strip to pull the strips apart. In fact, I had to remove a couple of nickel strips after I welded them to the battery terminal (6 welds per terminal) and they were very difficult to remove. I'm getting good penetration on the high setting from the strip to the battery terminal.
If you feel uncomfortable with this unit, I would look for one that states it can weld .2mm nickel strips!
Dennis
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Dennis,
Thank you for your response. I did order another welder. See link below. It is supposed to handle .3mm thick strips. I'll be using the .2mm strips but 10mm wide instead of 8mm wide. I feel a little extra wide shouldn't hurt anything and will give me extra conductor to aid in current flow.
I'll let everyone know how it works out. Again, thanks for your detailed article. Clever way of doing the balance leads.
https://www.amazon.com/dp/B0CB3KWD24?ref=ppx_yo2ov_dt_b_fed_asin_title
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I think that wider strips will leave more prominent dog ears when you fold to bring the 2 cells together. Maybe not significant, but bumps that could be potential sharp points.
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I think that wider strips will leave more prominent dog ears when you fold to bring the 2 cells together. Maybe not significant, but bumps that could be potential sharp points.
I thought of that. I'll let everyone know when I put my batteries together.
I also have some 0.15 x 8mm pure nickel strips that I'm thinking of doubling up between batteries. That would give 0.3 x 8mm strips.