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  1. J

    38120P vs 38120S Headways

    Little late here to reply. Ussyamoto, Headway no longer manufactures the 38120SP (38120P) cells (stopped around 3 years ago), they now only manufacture the 38120HP cells, both of which are 8Ah compared to the 38120SE (38120S or 38120L) cells which are 10Ah. I've attached some spec sheets...
  2. J

    Battery choice for go-kart build

    I've contacted parajared with concerns to his experience and issues and we are working together to come to a resolution.
  3. J

    Headway batteries advice

    Hey Travis glad to hear you went with Headway cells and hope that you are pleased with them! Per the OP's title "Headway batteries advice": Additional advice-just be aware, battery-matrix.com is no way a part of Headway Headquarters, LLC, as indicated in their description and the various...
  4. J

    Headway batteries advice

    You're welcome! Word! 8) Words of wisdom! Design the battery with a 2~3C discharge rate, and only if necessary, then it can handle the 10C rating if actually needed. Sorta like a stock Pinto and a stock Porsche, both will get you there, but one can provide the power when and if you need...
  5. J

    Headway batteries advice

    Got tied up, but here is the testing for the 40152SE 15Ah cell. The ambient temperature was 19*C during the tests, the cell was recharged at .5C, final high external temperature reading of the cell after 10C discharge was 63*C. Cells seemed to perform better once chemistry heats up, near end...
  6. J

    Headway batteries advice

    I expect them to perform well at up to 5C, but anything above that, watt power will suffer due to loss of energy through heat dissipation from the high discharge rates, but will know more after playtime with them this weekend. Will do a 1C, 3C 5C, and 10C continuous discharge tests and get them...
  7. J

    Headway Headquarters, Any Good?

    Send me a PM please, cannot go against forum rules and post prices outside the 'Sellers' area, sorry. :D
  8. J

    Headway batteries advice

    Hi MD. Thanks for redirecting back to the OP about the 40152SE, was a bit hot under the collar :oops: I do not have any recent data except what was provided to me from Headway, will work on a few 40152SE discharge tests and post them on this thread in the next few days. For what it is...
  9. J

    Headway batteries advice

    You are very welcome! We have never experienced breaking of the epoxy and have not had any requests for replacements due to breaking epoxy. The primary reason for returns are us are due to poor threaded or cross threaded cell ends. The epoxy does break IF the torque specifications are not...
  10. J

    Headway batteries advice

    We ARE NOT "a direct descendant of the evcomponent outfit", and if you do not know how it all worked out, it would probably be prudent to keep your negative and false comments to yourself! IF you want to know (at least the latest that I know of), simply check out the controversial Jack Rickard...
  11. J

    Headway batteries advice

    Not here to give advice or to promote, but to provide information. :wink: The testing may be done with ONE cell in at the factory but for me that is not quite good enough! :wink: Also the 38120HP cell is 25C pulse, will need to update the site, still had the old 38120P information there...
  12. J

    Headway 40152 Kit Components in SketchUp

    Excellent job, looks great!!!
  13. J

    Best BMS or a list of best BMS?

    In revisiting the thread, to refresh my memory, just for clarification, the BMS that was in your unfortunate fire chroot was a SignaLab V2.5 PCM, but I think I am safe to say that that was not the cause of the fire. :wink:
  14. J

    Help Building Basic Nice Looking eBike

    Hey Pingmustard, I am so sorry about the insta-information and graphs, but when you mentioned 'C' rating, (and you were correct in your guess of the 'C' rating!) I thought you knew a bit more than you admittedly do, so thanks for letting me know and I'll try and explain a bit better. :) A...
  15. J

    Help Building Basic Nice Looking eBike

    Hey Pingmustard, Welcome to the boards! For what my two cents is worth, I am not too familiar with the first battery that you listed with the alloy case in a rack, but as far as the Headway battery in a rack, that one has been known in the past to cause some headaches with the BMS/PCM that is...
  16. J

    Charging Headways with 2 MK3x8SMT BMS units.

    Sorry to hear of the troubles that you were having but good to hear that all is working out and that on top of that you are taking it in stride (as best as possible) as lessons in learning about your battery system. There are a few options on mounting those PCM's/BMS's, The most common way that...
  17. J

    Prospective purchase; have questions

    Just to be clear, it is not recommended to parallel two batteries together of different capacities (Ah) or of different chemistry was what my explanation was intended to mean :wink: As far as separating Headway battery packs into smaller packs, that can be accomplished too. Just a little...
  18. J

    Suggestion on headway pack / BMS

    Hi John, there are some PCM's/BMS's available that can handle that amount of current for the 5 seconds or so that you are looking for and dnmun has given a good recommendation! :mrgreen: For my two cents, I recommend using a PCM/BMS even for discharging at higher currents, just be sure to...
  19. J

    connecting three 48v15ah

    Thanks dnmun, Yes, these BMS's are fantastic, have onl1 had 1 return that I can think of since we have been using them. Onvolts, that is what most of us are here for, so pick our brains! :D Cheers!
  20. J

    connecting three 48v15ah

    Hey Onvolts, dogman and dnmun are correct, you can build a battery in a few separate areas/boxes and still be connected to one BMS and use one charger. Many full sized EV's are built this way. If you have any questions or need any suggestions please do not hesitate to ask, here is a 16S...
  21. J

    Why was my SLA pack better then my LiFePo4 on the hills?

    Hey dogman, thanks but wanted to just share with everyone about KingPan charger mods to help others in the future that may have this issue and are scratching their heads. The 3.5V and 3.3V scenario is what grabbed my attention too and I then knew at least where to start with the trouble...
  22. J

    Why was my SLA pack better then my LiFePo4 on the hills?

    Here is an excerpt from our DIY kit guidelines: "Modifying the charger: The charger has an automatic shut-off circuit board integrated in the charger itself. During charging, the BMS will shut-off charging if any cell is being overcharged (greater than 3.85V~3.95V), and once the cell voltage...
  23. J

    Why was my SLA pack better then my LiFePo4 on the hills?

    Okay, have not fully read through everything but it is getting late and I need to hit the rack so if this has already been said or addressed I apologize. e-beach, have you modified your charger yet by removing the safety PCB from within the charger? This PCB prevents the charger from 'talking'...
  24. J

    Headway battery pack FIRE! <lot pics>

    Although this would be ideal, UN3840 regulations and IATA regulations does not allow shipping of damaged batteries. There is much involved with shipping Li-ion cells and batteries.....if they are shipped properly and according to international shipping regulations. I may have misunderstood...
  25. J

    Headway battery pack FIRE! <lot pics>

    You're welcome, and thanks Alan, saw those which were the catalyst for my memory on which pack it was, I was referring to chroot's set-up on his ride to see how he had things set-up and how he had the battery mounted.
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