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  1. M

    need help wiring headway 38120S 10ah lifepo4 cells

    jim's handy drawings that helped me https://www.dropbox.com/s/lef2qj30msjx29q/2.jpg?dl=0 https://www.dropbox.com/s/k5ua4afhdti2gmo/1.jpg?dl=0
  2. M

    need help wiring headway 38120S 10ah lifepo4 cells

    hey Smithmal, I saw e-beach's post and he is prob right abt starting a new thread, but mainly bc I have exhausted my knowledge and the other dudes on the board would know more and help you better than I could, for sure. I did mine by hook or by crook and it works but there may be a better way...
  3. M

    need help wiring headway 38120S 10ah lifepo4 cells

    hey smithmal, "I'm assuming since you bought 38120 batteries from them they ship to the US." >>>>yep, from china, ~2-3 weeks to get here (ga) "In terms of quality, were you ever able to confirm that GWL's stated capacity of these batteries (8Ah) before adding them to your battery array and if...
  4. M

    need help wiring headway 38120S 10ah lifepo4 cells

    pretty sure I ordered most of mine from here: headway 38120S 10Ah LiFePO4 cell EV Components http://evcomponents.com/
  5. M

    need help wiring headway 38120S 10ah lifepo4 cells

    what is correct full charge of a lifepo4 12V40ah cell GWL/Power Lithium Battery 12V/90Ah http://www.ev-power.eu/LiFeYPO4-batteries-12V-1-1/Lithium-Battery-12V-90Ah-WB-LP12V90AH.html?cur=1 LP = 12V Battery block LFP = 3,2V Cell (4 x 3,2= 12,8V) needs BMS (Battery Management System) for...
  6. M

    need help wiring headway 38120S 10ah lifepo4 cells

    hey smithmal, I am just barely literate in this battery stuff but basically it worked fine and is still working, though it seems not to hold as much of a charge are originally, like before maybe 13.7 max or something and now right at 12.9. I did *not* add a BDS thing to it and that might be...
  7. M

    need help wiring headway 38120S 10ah lifepo4 cells

  8. M

    need help wiring headway 38120S 10ah lifepo4 cells

    The charger I'm using
  9. M

    need help wiring headway 38120S 10ah lifepo4 cells

    Thanks fechter. I appreciate your help very much. The battery pack is now reading like 13.4 so that is a little better and the charger says "fuel" is like 80%. The smart charger I am using has all these crazy settings but i am using of course is the LiFe and in there it says it ends at 14.4. But...
  10. M

    need help wiring headway 38120S 10ah lifepo4 cells

    Status update: - refresher, this is a 16 cell headway lifepo4 battery pack, for powering a boat trolling motor and a fishfinder/ first charge with a charger, and now attached to 50W solar panel - worked on it first test, but only for about 2 hours, however that was wide open on the 12 volt...
  11. M

    need help wiring headway 38120S 10ah lifepo4 cells

    thanks teklektik, not sure I understand it all. I am in the process of testing as fechter wisely recommended. I am not sure how to add a bms to my setup (pictures above), and have heard I do not need one and heard that I do. I was hoping/thinking that my solar charge controller (its an mppt...
  12. M

    need help wiring headway 38120S 10ah lifepo4 cells

    ok, thanks fechter, and sorry to misspell your name before. and thanks everyone who replied so far. very helpful. when I get a second I am going to do these test and will report back. thanks again.
  13. M

    need help wiring headway 38120S 10ah lifepo4 cells

    thanks all. also, so that is to say that when I am done charging the battery pack of 16 cells should show a 'full charge' reading on a multimeter of 14.4 volts? or do I need to set the charger to a setting that is 14.4 volts, or both. I guess what I am asking is, when and if it is done, the...
  14. M

    need help wiring headway 38120S 10ah lifepo4 cells

  15. M

    need help wiring headway 38120S 10ah lifepo4 cells

    thanks fecher, this is very helpful and down on my level, which is what I need! 1) first I will try my charger set at 14.4v and see what happens. 2) then, if no change, I will test the 4 groups of the 4 cells. would this way I have diagrammed (picture after this post) be a good/safe/accurate...
  16. M

    need help wiring headway 38120S 10ah lifepo4 cells

  17. M

    need help wiring headway 38120S 10ah lifepo4 cells

  18. M

    need help wiring headway 38120S 10ah lifepo4 cells

    thanks very, very much, Fetcher and AmberWolf. I know exactly what you mean in terms of the 'bad cells may be dragging down the good cells', and the great idea to isolate the cell packs. unfortunately, I am working above my pay grade here so actually doing the tests may require a little more...
  19. M

    need help wiring headway 38120S 10ah lifepo4 cells

    Hello, I have sixteen of these: 38120S 10Ah Headway Energy Cells, wired to be a 12v40aH cell. (Pls see uploaded pic). Am using it to power a 12V, 62lb thrust trolling motor and a fishifinder. (I did all the balancing before assembling into the final cell). i am using a solar charge controller...
  20. M

    choosing between Winston LiFeYPO4 vs. Headway 38120S cells

    thank you dustNbone and wesnewell. you guys are tops, no matter what they say. haha, jk. thank you!
  21. M

    where is the best place buy headway 10Ah lifepo4 cells?

    Thank you Amberwolf
  22. M

    choosing between Winston LiFeYPO4 vs. Headway 38120S cells

    Thx for chiming in again, Wes. Good stuff. So get to my desired 12v40Ah, would i wire those 4 winstons in series or parallal? and the same balancing charger (link below) would work w/o any probs, right? Thank YOU...
  23. M

    choosing between Winston LiFeYPO4 vs. Headway 38120S cells

    I’m trying to use lifepo4 cells to create a 12V40Ah battery pack, to power a 62lb thurst boat trolling motor. Users here have been *VERY* helpful in getting me this far. my new question is this, I have been working with Headway 38120S 10Ah LiFePO4 cells (~$15.50 each), but as I was about to...
  24. M

    where is the best place buy headway 10Ah lifepo4 cells?

    where is the best place online buy headway 10Ah lifepo4 (38120) cells? I have had good response and service from http://evcomponents.com, but am about to order 16 more, and wanted ask the Group, where do you purchase yours? thanks!
  25. M

    need help wiring headway 38120S 10ah lifepo4 cells

    alrighty, doing that next, thx
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