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  1. M

    Turnigy Accutel 6 always overcharges one cell

    So every time I go to charge either my LiFePO4 or my RC lithiums, both 4S, the first, or maybe its the last cell, the one first in the list, always overcharges about 0.3-0.5 volts over the others. I switched the cell order and tried 3P to make sure it wasnt the cell. I tried to discharge them...
  2. M

    Source for cheap recycled LiFePO4 cells?

    I want to build a lithium lead acid replacement type battery bank for a solar and alternator powered RV (12.8v ~100ah, ~80a), on a budget. Whats the cheapest source and or type (18650s, prismatic, etc) for cells? I was thinking about maybe salvaged EV block cells, or someone online that...
  3. M

    Basic BMS question-no separate charge/load terminals?

    I've been asking around, havent got a clear answer to this: I want to build a 12.8v 100aH 100 amp peak battery bank for a solar system/alternator on an RV. I have some existing Chinese LiFePo4 batteries (banks,4S60P 18650 cells ) with BMS on board that function like Lead Acid in that they...
  4. M

    Using a Turnigy 6 to balance a LiFePo4 4S w/ reversed wires?

    So good news, I connected it (in reverse order basically), it read and balance charged no problem--so WIN. However, the 4s60p pack will not charge over ~12.8v, while my other packs will go to 13.4v--the Accutel stops charging, says "reached capacity" at about 13.1v then drops after down to...
  5. M

    Using a Turnigy 6 to balance a LiFePo4 4S w/ reversed wires?

    OK, thanks, also I found this: http://www.tjinguytech.com/charging-how-tos/balance-connectors Sorry for all the ignorance on my part, I get it now. The first and last wires will be neg only and pos only, the ones in between are connected IN SERIES (duh) I just need to find that type of...
  6. M

    Using a Turnigy 6 to balance a LiFePo4 4S w/ reversed wires?

    Yikes--Ok first off all THANKS sincerely, for all the 'splaining, taking all the time to help me figure this out. Now after reading all that twice, my little brain hurts and I still cant picture it. But here's a thousand words about my lead as I tested it, this is what I do know: Now what...
  7. M

    Using a Turnigy 6 to balance a LiFePo4 4S w/ reversed wires?

    I guess what im not sure about is: So the balance port(s) pins going in to the charger are 1st pos, 2nd neg, 3rd neg, 4th neg, etc. like RC lipo packs. If I wire a plug that is 1st neg, 2nd pos, 3rd pos, etc., like my lifepo4 balance lead, wont the polarity be a problem? Or can the Accutel...
  8. M

    Using a Turnigy 6 to balance a LiFePo4 4S w/ reversed wires?

    I will keep that in mind and post accordingly, thanks :oops: . I do want to say I dont start new threads thoughtlessly, or purely for my benefit or to bump up to the top The way I've approached forums is that I'm thinking of other people (members or not) with the same problem, can search and...
  9. M

    Using a Turnigy 6 to balance a LiFePo4 4S w/ reversed wires?

    I have a Turnigy Accutel 6 I use to charge the RC lipos for my eMTB. I would like to balance charge y 4S LiFePo4 pack that I think has a BMS type wiring (as in picture). The Accutel is wired for RC packs, which has the opposite wiring (one pos/4 neg). I'm not even sure the voltage is...
  10. M

    Can you tell me anything about this BMS?

    Thanks sunder yeah its 5 black wires all connected/soldered to the board "in", and 5 soldered together coming from the out point of the board (then going underneath back to the cell pack) 10 total 12g neg wires.
  11. M

    Can you tell me anything about this BMS?

    Thanks guys I should have been more specific...there are fat 5 Fat (~12g) black wires soldered together touching, to the board going in and then out. Which I'm pretty sure one cant be positive. So it was a bad BMS...man these things are crap. I'd really need a good replacement. Are there...
  12. M

    Can you tell me anything about this BMS?

    I need to replace this, from a 4s60p "deep cycle lead acid auto/boat replacement" 150ah Supposedly 100amp ch/dch Single neg port/terminal, charge and discharge/load common input/output(no separate charging input) like lead acid. One question is: why are there 5 wires going in and 5 out if this...
  13. M

    Is this soldered in backwards?

    Thanks, case closed.
  14. M

    Is this soldered in backwards?

    This (shunt resistor, current sensor?) is backwards, do these require current to flow a certain direction through, or does it not matter?
  15. M

    Can you tell me anything about this BMS?

    thanks for that, one more question: so this is a 4s configuration, but there are 5 fat black wires going in and out of the bms. What its the fifth wire?
  16. M

    Can you tell me anything about this BMS?

    thanks for posting fechter they are lifepo4 yeah there are no burnt ones where is the voltage detector on the board and is it replaceable? yes i was just perusing bestech It is a bms/pcm that charges and discharges load through same 2 terminals, is that a specialized bms, or can any be wired...
  17. M

    BMS with shared Charge/Discharge circuit term?

    This is probably a simple question. What is the term for a BMS board that shares its charge and discharge input output, i.e. no separate charging port or terminal? I am trying to replace a BMS board from a "drop in lead acid replacement automotive/marine type to LiFePO4 cell deep cycle...
  18. M

    Can you tell me anything about this BMS?

    Hello all, I have a couple bad BMS boards from a "drop-in replacement for lead acid deep cycle battery", 12v 4s ~100A Ch/Dch, 150Ah Charge/Discharge through same input/output, main terminal posts. It is probably a bad mosfet, possibly IC. From accidental short circuit. The cells are fine...
  19. M

    Change from 8S 33v lipo battery setup to 36v LiFePO4

    Thanks wee--yeah you might be right. I know there must be some sort of electrical solution to the problem, some sort of voltage reducer/limiter circuitboard that can handle the high current/amp draw. I am just ignorant of how to do it, but I imagine it would be too bulky or expensive. I did...
  20. M

    Chinese "Dual" eBoard ESCs

    http://www.fliermodel.com/en/products.asp?bigclass=87 These are new since I built my board a few months ago. Software looks decent too. Source: http://pt.aliexpress.com/store/group/ESC-for-skateboard/513485_500123145.html?spm=2114.8147860.0.88.zuCFTf Sorry if this is old news to you.
  21. M

    Change from 8S 33v lipo battery setup to 36v LiFePO4

    So my eMTB uses 2x parallel Turnigy TrackStar 200amp ESCs, both labeled "34v max" on the side. I was thinking about switching to a 36v LiFePO4 battery. The 2 extra volts, probably wouldnt be a problem, but a fully charged 36v LiFePO4 battery actually maxes out at 45v or something like that. I'm...
  22. M

    An easier way to charge batteries?

    So I have a 2S2P RC battery pack setup (8S), right now I have to charge each battery pack separately. I would like to just plug in to charge/balance everything at once, like my old LiFePO4 board that had a BMS. I would just plug in 12v DC adapter from wall to BMS and after a while everything was...
  23. M

    Anyone put thought into "reGen" braking add-on?

    I have enough hills in my area (SF, CA) to make me wonder if anyone has tried to convert or add a circuit to collect power during braking/downhill and route it back to charge the batteries? Does anyone have any ideas about adding something like this to a somewhat standard eMTB/RC build? Thanks
  24. M

    Using "Gun"-style RC throttle? Might be issue with cops...

    I was showing a nice British man my eMTB setup, showing him the throttle (Quanum 2.4Ghz 3ch Pistol Grip), when he brought up a worthwhile issue--that the throttle looks enough like a gun to maybe confuse or give a cop an excuse to use his. I kind of laughed it off at the time, but since then...
  25. M

    A complete hub motor longboard wheel I can buy/order?

    Yes, exactly--thx Vulthor
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