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  1. C

    18650 spot welding -how to- ULTIMATE REPOSITORY

    I thought I'd follow up on my status with respect to fechter's method. My 3S graphene Turnigy 5000 mAh battery arrived and in preparation for a trial with my delivery system (based upon a small engine starter relay) I wanted to get an estimate of where my current would be at relative to the...
  2. C

    18650 spot welding -how to- ULTIMATE REPOSITORY

    Wow.. Amazing 570A. Will definitely look into. 600CCA lead acid ain't cheap either, and the form factor and weight advantage is awesome. I think I can find other uses for this battery too. Roughly how many welds do you do before recharging? I found a graphene 3S 5000 mAh Turnigy RC Lipo for...
  3. C

    18650 spot welding -how to- ULTIMATE REPOSITORY

    Thanks. I'll look into maybe a 600cca then.
  4. C

    18650 spot welding -how to- ULTIMATE REPOSITORY

    Mine is rated at CCA 325A, an old battery from my Prius which may well now indeed be less than that. Yesterday, after changing the shape of my electrode tips from rounded to more pointed -- less surface contact area -- I was successful with a dual pulse of 30 / 60 ms in multiple welds at lower...
  5. C

    18650 spot welding -how to- ULTIMATE REPOSITORY

    Hello. I'm new to ES and pretty new to 18650 technology. I'd appreciate any feedback on a project I'm working on. I am trying to spot weld 18650 cells using a 12V car battery (45Ah, 325CCA) as a current source. I have a Nano controlling pulse length and have verified accuracy with my...
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