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  1. Honk

    Graphene Aluminium / alumumin ion

    It looks just like the typical holy graal vapor ware article. All the positive parts are mentioned but the heavy drawbacks is not brought forward and we will probably never see or hear about this "inovation" again.
  2. Honk

    Li-ion cells cycle ageing

    Samsung 29E6 looks really strong in these tests. It makes me smile as I have a few hundreds of E6 in my freezer for future use.
  3. Honk

    Li-ion cells cycle ageing

    Zilch - so I don't expect or demand anything from him. It was just some basic curiosity from my side. A few promising cells could be selected to narrow the effort. And it might interest docware himself, based on curiosity!
  4. Honk

    Li-ion cells cycle ageing

    Now that you have confirmed cell performance at modest cycling then perhaps it's time for a more brutal approach. E'g full 4.2V charging at high currents and high discharge rate down to 3V to simulate how folks tend to build their light weight packs and kind of abuse them hard. It could be fun...
  5. Honk

    NCM cells

    What's the actual sales price of this square puppy?
  6. Honk

    Li-ion cells cycle ageing

    These tests are so vital and important to sort out the lesser good models in the djungle of batteries. And one important thing can be determined by the results, that is 29E keeping its golden crown among contenders in form of the best bang for the buck. I'm glad I bought 29E a while ago by...
  7. Honk

    Li-ion cells cycle ageing

    I think he means 65mOhm per cell. And that makes sense when calculating.
  8. Honk

    Choosing new battery

    No, but you mentioned all these batteries at your initial post. If you don't want my advice then please forget what I said. I was just trying to be friendly and help you out.
  9. Honk

    Choosing new battery

    @Carcharodon Carcharias Just so you know... there is a thread about testing different cells how they age at load and GA, 30Q and PF is among the worst performers of the cells being tested. Ageing chart: https://endless-sphere.com/forums/download/file.php?id=269518 And the thread itself...
  10. Honk

    Li-ion cells cycle ageing

    From the chart it looks like 35E could be the new GA in terms of capacity decay. I also wonder how a 18650 cell of LifePO4 would come out in tests like these. It might reveal something we never thought of, or just imagined how it should behave by myth.
  11. Honk

    Thread for new battery breakthrough PR releases

    Unless life extension research is successful within the next 5-10 years... :mrgreen:
  12. Honk

    Li-ion cells cycle ageing

    Wow, extremely good and informative measurement. I can't imagine how you manage all these tests in such short timeline. Keep up the good work, it is so very great of you taking the time doing this.
  13. Honk

    Magnets holding copper bus onto cell, no-weld no-solder

    It looks like the cannister and button thickness of my 29E is about 0.5mm max (perhaps thinner). That is the value to enter as back iron with no return loop (open air magnetic circuit). If I remember correctly the iron thickness should be at least 25% of the magnets thickness to avoid field...
  14. Honk

    Magnets holding copper bus onto cell, no-weld no-solder

    Don't fool yourself. The stated pull requires a certain thickness of opposite iron to meet specifications. There is free magnetic pull calculators online where you can enter the data and get the real pull force.
  15. Honk

    Li-ion cells cycle ageing

    That's because the charge current at 3.5V is maximum, e'g 2.5A in your case. Above 4V the charge current is just a fraction of 2.5A as this is close to finished. If one had forced 2.5A charge current into the battery during the whole charge cycle one would live in danger for fire, not to talk of...
  16. Honk

    Thread for new battery breakthrough PR releases

    Loosing 25% capacity after 200 cycles is not impressive, rather lousy actually. But they don't seem to care about that small "issue". Easily fixed they might think, but probably not and the waiting for truly good LiS batteries continues....
  17. Honk

    Surplus LiFePO4 packs 4KWH 24V 220AH.

    LiFePO4 has no real advantage over e'g NCM cells. Neither at weight, capacity or price. LiFePO4 had its glory days but we are far past that time now and looking forward to even better chemistries.
  18. Honk

    Best 18650 cell for 3p 18A max

    30Q has actually bad cycle life. https://endless-sphere.com/forums/viewtopic.php?f=14&t=103092&p=1517813&sid=2b8a066d606a76c2596e4b922be803c2#p1517372 https://endless-sphere.com/forums/viewtopic.php?f=14&t=97844&p=1435146#p1433642
  19. Honk

    Best 18650 cell for 3p 18A max

    Why limit yourself to 3P unless the space available is really tight. More cells in parallel increases cell life dramatically. (typo corrected)
  20. Honk

    Li-ion cells cycle ageing

    Hi Pajda and thank's for the clarification. I suspected this was the case but it's better to ask than being uncertain. So far LG M36 looks like the new killer cell stealing the crown in terms of cycle ageing properties.
  21. Honk

    Li-ion cells cycle ageing

    Hi Great charts and testing but something strikes me as odd. When charged to 4.1V the cells should be approx 90% full, meaning e'g 29E should have about 2.6ah capacity available. But the chart starts 2.2ah ??? Could you please explain this in case I have missed some test info! Love this type...
  22. Honk

    Thread for new battery breakthrough PR releases

    Ok, I change my statement to "Any strange technical oddities in a press release, articles with extraordinary claims or technical papers is often a fraudulent sign".
  23. Honk

    Thread for new battery breakthrough PR releases

    Any technical oddity in press releases if often a sign of bullshit and wapor ware. The press release itself is just a fraud and the intent is raising investment capital.
  24. Honk

    Is a 24s battery dangerous?

    You could build three separate batteryblocks that you connect in series to your para-flight system. Kind of safer if properly designed.
  25. Honk

    Is a 24s battery dangerous?

    Don't forget or leave out a truly good BMS or you will by 100% certainty run into troubble.
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