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  1. Bubba

    DIY CNC Router

    Sweet build. What did you use for the drivers and controller, software etc.?
  2. Bubba

    Pure Nickel strip

    I see advertised all the time nickel strip by the 1kg (or lb) What length should you expect for say 0.15x8mm or other dimensions.
  3. Bubba

    Testing 3D Printed Charging Slots From Thingiverse

    Have you tried Watts-on's design.
  4. Bubba

    16 Cell 18650 Charger/Discharger Board Module

    Looks like it is coming along nicely. Please don't take me wrong ... but starting to look like the layout of the MegaCell charger? Hey could I recommend you to look at 3D printing your own Cell holder based on Watts-on...
  5. Bubba

    Damaged Cells

    I plan on binning the dented cells, but saving them for an outdoor project where my living isn't at risk :) If there rust under the wrapper, I bin them for recycle. I found if rust from a bolt (external caused rust) hits the cell, then it causes the cell to rust a short time later. Any smell...
  6. Bubba

    Hello From Chicago!

    Welcome Mike. So you joined.... are you thinking of building a Powerwall or just interested in the topic of 18650 cells etc.
  7. Bubba

    Behaviour of cells in parallel take 2

    Could I get the Coles Notes? Sorry my brain is a bit scrambled Not seeing the obvious. Would like to see low amp draw and high amp draws. Running the cells from full charge to cuttoff. I believe (without evidence) that mix of high draw cells with lower draw cells (various chemistries) is...
  8. Bubba

    Behaviour of cells in parallel take 2

    Are these the same chemistry? I do find interesting these cells were never sold to the public. They were for pack design only and a limited run. At least that Is what I read at one point. I was hoping to see the reaction between cells with such low IR and high IR... make things obvious. :)
  9. Bubba

    Behaviour of cells in parallel take 2

    Too bad you don't live near me I have boxes of bad ones with all different levels of bad. Funny for the IR / SOH those number match my database looking at the trends to determine a good IR for sorting. The US18650GR series of cells I haven't had too many that were any good (>80%) Hey Wolf...
  10. Bubba

    Thunderheart's Battery Tests

    This is a great idea. A local shop I know of they get the Queen batteries exclusivly. Now I know why. They seem to rate quite well.
  11. Bubba

    16 Cell 18650 Charger/Discharger Board Module

    Is there auto routing or does it have to be done manually. I remember using Orcad back in the day on a 386 cpu. I always started with required locations of the most important items first. Followed by placing the items by the most connections that could be straight (if that makes sense to you)...
  12. Bubba

    Charging a 12s battery can you do this?

    Are thinking of bypassing the BMS? Does your charger have managment to stop charging when the cells are full?
  13. Bubba

    4-wire test fixture

    Does anyone have a good design for the terminals of a 4-wire tester? Or know of a good source for not so expensive ones?
  14. Bubba

    IR Meter Recommendations

    Just don't do what I did. The pin touched the wrong part of the cell and melted :mad::mad: Yes cell holder is Definitely worth it. I also bought the Premium cables and found them quite good. AliExpress seller I bought mine from (recommended) is "on the simmer"
  15. Bubba

    Mind blowing realization about IR

    Different chemistries at high current will cause issues like you describe. Typically chemistries that are able to supply higher instantaneous current have lower IR. Does this fit?
  16. Bubba

    Mind blowing realization about IR

    Based on the information I see, Fig 3 for example, SOC has no real effect on the Internal Resistance factor. SOC for 1kHz tester such as YR1035 or RC3563 is basically also irrelevant if done at room temperature. I always measure my cells at room temperature. Be careful reading that report...
  17. Bubba

    Safe Ambient Temperature Range for 18650 Powerwall

    in Windows you can use Alt+0176 (most setups) to make the degrees °C
  18. Bubba

    I think I found the issue... HEATERS!

    What we need is an active balancer with tracking. Most active balancers are dumb, but I wonder if the Heltec BMS with active balancing records balance info. Technically this data is found in a BMS that records the voltage. You can see which cell packs that are always Lagging to full charge...
  19. Bubba

    Constant Current Diode

    Looking for true Constant Current. This device also has built in protections that the mosfet resistor alone don't. For me this is a safety issue. Is possibly a cleaner solution (complete CC circuitry in 1 package). Don't need to adjust or set PWM cycles. Less tracking of current setting to...
  20. Bubba

    Constant Current Diode

    Yes would need to check voltage for termination of the discharge. (I haven't found a CLD that cuts out at 3V for Lithium Ion etc.) Would use the lower cutoff as a backup in-case of Arduino failure etc. It would be automatic built into the CLD. Wiring should be greatly simplified and I would...