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    mass life cycle testing

    Exciting thread. 8) I'm planning to do about the same. But DIY arduino tester controlled via PC software. Data logging to dropbox. Software will look something like this: Cells waiting: Heter Lifepo4 LG ABB41865 LG GBMG11865 MG1 LG ICR18650-HE2 LG MJ1 Panasonic 18650PF Panasonic NCR18650B...
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    Best battery Deals on 11 11 Chinese sale!?

    Why not https://eu.nkon.nl/rechargeable/18650-size.html ?
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    Good batteries for rebuilding laptop battery pack

    Replaced the Dell vostro cells voltage still above 2v without disconnecting. Laptop shows not above 7% but still works full capacity charge/discharge 0-100%. NCR18650A cells. So yeah very sneaky chips they are. Other option are directly powering laptop to AC side with DIY battery and own BMS or...
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    Lightweight lithium battery for car

    How you implement LVC for car battery? Latching solenoid exist?
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    Spot welder doesn't work with 0.15mm pure nickel

    I have 787A+ Sometimes If i switch on the welder it welds very poorly. Strangely sometimes when i switch it off and on again then suddenly all welds doing ok. Max is 0.15 pure nickel or barely 0.2mm ni-plated steel. I use multiple layer 0.1mm pure nickel just to be sure. And solder extra copper...
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    Highest capacity 18650 cells

    ~95% us use about 10 different cells max i think. I have ~20 different cells waiting for cycle testing over 2 years now. Start testing when i retire from work. So first test is like aging test running now :)
  7. D

    Highest capacity 18650 cells

    LG INR18650-M36 has 3600mAh label just for getting your attention. 3500mAh 35E etc have still bigger capacity in test results and are lighter in weight too! Fake 4K TVs and now THIS, cmon LG :evil: Cycle life is the most important parameter i think but strangely we still have so less...
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    Cycle Life tests or experience with Panasonic NCR18650GA vs LG MJ1 vs Samsung INR18650-35E

    What you are talking about? PF is 2.3€/qty and you have to buy 540pcs to get this price 29E is 2.14€/qty if you buy 200pcs. Shipping to Europe is always about 15€ even if you buy thousands of them. Tumich sells 29E ~2.10€/pcs inc shipping. Little bit cheaper but buying from Nkon store should be...
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    Cycle Life tests or experience with Panasonic NCR18650GA vs LG MJ1 vs Samsung INR18650-35E

    What about even cheaper Samsung INR18650-29E 2.14€/qty? As good as PF? https://i.imgur.com/4iKFhMc.png
  10. D

    Thread for new battery breakthrough PR releases

    NCR18650AU 4.9Ah 18650 cell https://www.youtube.com/watch?v=hcPwdBcXsrg :P
  11. D

    If you are building packs today, which cells to choose?

    29E has this very rare LiNiCoO2 chemistry that never seen in 18650 cells. Very curious to know what cells wins cycle test. :)
  12. D

    If you are building packs today, which cells to choose?

    Interesting, have to test this. But you cant go wrong with 25R cells? 2.35€ @ nkon :)
  13. D

    If you are building packs today, which cells to choose?

    Very good 35E price (3.1€) right now from nkon https://eu.nkon.nl/rechargeable/18650-size/samsung-inr18650-35e.html Very curios about cycle life vs PF cell. In electric car, cycle life matters 7x more!
  14. D

    Homemade Battery Packs

    Safe connection? https://i.imgur.com/gV8Kxt8.jpg
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    18650 spot welding -how to- ULTIMATE REPOSITORY

    Pure nickel strip confirmed! Worlds cheapest?
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    The 3500mAh heavyweight division: Sanyo NCR18650GA vs Panasonic NCR18650GA vs LG MJ1 vs Samsung INR18650-35E

    To see cycle test for them is my ultimate dream :o So then I can decide which goes to my future i-miev 40kWh battery extener.
  17. D

    2 wire high voltage battery voltmeters and more

    Very nice stuff. Ordered BABY brother and Mac Daddy's little brother yesterday. Usually these similiar 100V 10A models require external power and price is higher too ~9$ But if you still need separate external power, Im using these work great 40-320V DC input: 12V...
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    Homemade Battery Packs

    Check voltages every 5th charging or so at first. If they get out of balance then add BMS. My panasonic 18650PF packs 22S18P 14S12P using every day over a year without BMS and still perfectly in balance. Checking voltages every three months now.
  19. D

    problems with cheap DC DC boost supplies for charging?

    Mine has problems too. Current is not constant. Decreases when charging battery. Maybe because im using it to 92.4V (22S) output ~55V Offgrid 14S input.
  20. D

    dc dc cnverters, 12-80V -- where??

    There is also fake LM2596HV-s araound (blow up at ~50V), so be careful. https://www.youtube.com/watch?v=JLwJb4MVbls
  21. D

    dc dc cnverters, 12-80V -- where??

    http://www.ebay.com/itm/172860794791 72v and up is for AC adapters territory.
  22. D

    reasonably priced 0-60V power supply? ~10A or more

    It's all about mass market. Only cheap way = DIY
  23. D

    48V vs 72V

    Motor: Magic pie2 (internal controller) Battery: 16S Lifepo4 (52V) Speed tailwind: ~45km/h Power: ~1000W Upgrade to external Lyen 12fet controller Added 3-speed switch so no no jerky at slow rides. Battery: 22S Lion (79V) Speed without wind 60km/h Speed tailwind 74km/h :mrgreen: Power: 2700W...
  24. D

    Anybody have experience with Sun-Ebike.com?

    Lifepo4 is twice heavier, twice volume than INR. So only good for home energy storage.
  25. D

    General warning to all who make custom packs.

    Cant find it on Banggood and if i try buy directly then it is 79$ :shock: shipping to my country. What do you think about ceramic paper? Seems good isolation and fireproof.
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