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  1. S

    Replacing NiMH batteries with Li-Ion

    Thanks for the info. The way this pack is build, it has a thermistor between two of the cells, that, based on the markings, cuts the circuit at 70*c. Although I would like to to devise a way to power it with a 2S2P 18650 setup, which if I were to use my 3200mAh cells, would give something like...
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    Replacing NiMH batteries with Li-Ion

    First, let me start by saying I know that NiMH chargers are not meant for use with Li-Ion and would likely destroy the cells at minimum (and best case) - my thought is to not charge the batteries with the original charge mechanism. Let's assume for a second that I want to make a pack where the...
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    kWeld - "Next level" DIY battery spot welder

    Absolutely. I haven't used mine much yet because I've been awaiting the delivery of a MegaCell Charger to allow me to do better charging and testing than my LitoKala charger can do before I build more packs, but what I've done, right out of the gate, it was orders of magnitude better and more...
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    kWeld - "Next level" DIY battery spot welder

    I think the 'real' answer is 'the shorter the better', but the stock negative cable is about 9cm long, and the positive I believe is about 10cm.
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    Building a 'different layout' 7s4p pack

    I'm fairly new to to the lithium pack building 'scene', although I've been working with electronics for many years, so the basics are pretty simple. Building a 7s4p pack in the simplest of layouts, 7 long by 4 wide, is, well, simple. But I'm faced with a pack that I want to build where I'd like...
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    kWeld - "Next level" DIY battery spot welder

    So I FINALLY got the XT90 connectors that USPS was supposed to have delivered LAST Saturday and was able to complete my setup and actually use my kWeld. I think to say that the kWeld is better and more consistent than the Suckko welder I had originally tried is the understatement of the century...
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    kWeld - "Next level" DIY battery spot welder

    Looks like a pretty good setup (not judging the alligator clips as they look beefy and charging, you're not really typically pushing a crazy amount of current - for the initial charge of my new packs, I used MUCH less substantial clips and wires from the charger, but I was only charging at 1A)...
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    kWeld - "Next level" DIY battery spot welder

    My guess is that the XT90 on the leads into the kWeld (as well as the parallel adapter) would have trouble with the current. What gauge wire is used from that XT90 to the kWeld? It's not going to blow up or melt down just plugging it in, but doing welding could result in 'some heat'. My original...
  9. S

    18650 cell substitute for weld testing

    Well, yes, testing on dead cells would work, except you can't just flip it over and see what the actual penetration was. Maybe I'm over thinking it lol. That could work but I'm not sure I want to be pulling apart alkaline batteries... I remember LONG ago when I was doing something stupid and...
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    kWeld - "Next level" DIY battery spot welder

    Thanks Frank - when you say 'make absolutely sure not to extend the cables', I assume you mean ANY cable, including the inputs? If so, I'm guessing that rather than make a 'Y' (Or really more of a 'V' cable) with two XT90's on one end for the packs and a XT150 pair on the other to join up with...
  11. S

    18650 cell substitute for weld testing

    As the title suggests, what would be a good substitute for an 18650 cell that is easily obtained that would allow for testing and dialing in of a welders pulse, so you could see an accurate representation of the penetration of the weld on the under side of the weld? I've seen people use utility...
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    kWeld - "Next level" DIY battery spot welder

    Got my kWeld yesterday and got it all together, just waiting on the power source now. For the power source, I ordered two Turnigy Nano-tech 5000mAh batteries, with the intent to run them in parallel to reduce the 'abuse' on each battery, but I've read what seem to be conflicting information...
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    kWeld - "Next level" DIY battery spot welder

    Just so I'm clear - even though the kWeld can go down to 4v, suggesting that these in a 2s arrangement should work, they would really need to be in a 4s arrangement because the kWeld would actually want the voltage higher than 6v on batteries? Unrelated to that, just a thought - if you ever...
  14. S

    Battery welding issues

    Thanks, that kind of input was very helpful. The Sunkko is on its way back and I'll be purchasing a kWeld.
  15. S

    kWeld - "Next level" DIY battery spot welder

    Thanks, I kind of suspected that was the case but wasn't 100% positive. I did actually end up reading more on it a handful of pages after I posted the question. Now I just will need to figure out what to power it with. Related to what to power it with, I read a post or two about the headway...
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    kWeld - "Next level" DIY battery spot welder

    I've been working through this thread reading up on the unit and will be ordering one, probably next week, but I have one question that I haven't really seen the answer to. Is the 'kSupply' able to be used to run the kWeld instead of using a battery pack, or is it just meant to charge/power the...
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    Battery welding issues

    Does anyone else have any thoughts? Should I stick with this one and 'try to make it work', or should I send it back? Is the JP Welder really better (it and the 709A are the top two whose links still work in the previously mentioned thread)? I have no problem sending this back and getting the...
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    Battery welding issues

    I wouldn't exactly say the cables 'jump all over the place', but they do have a noticeable twitch to them, I'd say. So this is the handheld 'pen' it came with: This is the OD of one wire - granted, insulation and all. Here's where the copper comes out of the insulation: Based on how...
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    Battery welding issues

    I've been playing with 18650 cells for a little bit now, recovering cells from various sources, testing them and such, and am going in the direction of starting to build some small packs. The first 7s pack I put together, I soldered (Yes, I know, not generally a good idea, but I was careful...
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