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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?

    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...
  5. 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?
  6. 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...
  7. 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...
  8. 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.
  9. 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...
  10. 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...
  11. 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
  12. 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...
  13. M

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

    How far away are we from having a complete working longboard hub motor wheel(s) I can buy complete, for a 2WD setup (Kv/power) preferably. I just got done building my eMTB, now I want a longboard, but I thought I'd wait until there are some decent dual hub motor kits available. Pediglide...
  14. M

    Which is a better setup...2x2series or 1x2S2P (to 2 ESCs)?

    In my mind, besides some wiring differences, these two setups would work basically the same, but I wanted to run it by you guys. Of course, both ESCs are controlled by one reciever. Please see attachment... Is there something I havent considered?
  15. M

    Want to switch MB deck with tailed deck...

    So I am using an MBS COMP95 deck, I want to be able to use a tail to lift front and turn, which means I need a deck that is: a) shorter b) has angled ends to mount MBS MB trucks (flat wont turn, obviously--have to cant somehow) c) has enough tail to lift front end Has anyone seen anything like...
  16. M

    Charger/balancer stops at 3.7v per cell

    I just got an Turnigy Accutel 8S Charger. I read the manual, and I tried to charge/balance up my 4S battery, but it seems it wont charge beyond/finishes at 3.7v (nominal)per cell. My cheapo DC-4S charges them all up to 4.21 (full). I can't seem to find a setting to increase the voltage limit...
  17. M

    My eMTB Build

    So I wanted to document my build a bit, to share some of the problems and solutions I encountered so that maybe it will help other people. I wanted to thank everyone that has been answering my posts, especially torqueboards, who is especially generous with his knowledge and time. PICTURES TO...
  18. M

    Mixing batteries with different discharge ratings?

    So I have 2x 4S 45C Flightmaxs (8S) What discharge will I get if I parallel connect in 2 more 4S 60C "Heavy Duty"?
  19. M

    Mixing LiPo battery packs

    So right now I have 2x ZIPPY Flightmax 4000mAh 4S1P 45C for 8S total. I think I want to increase the Amp hours for a little more ride time with 2 more 4S packs in parallel. My first instinct is to just get 2 more of the same because everything works well as is and that seems to be the smartest...
  20. M

    A simple inline meter to read 8S/32v power like gas gauge

    I'm looking for an easy to read simple meter to gauge how much ride time/power I have left on my 8S/32-34v build. A cheap LCD or LED bar graph would be ideal. Any suggestions--Thanks
  21. M

    Aluminum Plate on eBay (for eMTB motor mounts)

    So I got in touch with TEMCO, a company on eBay that sells rectangular 1/4" aluminum plate at VERY low prices. I asked them about getting a custom size to mount on my MBS trucks. Within a day, they sent me a link to an auction for that exact size. The way they do it is you tell them what size...
  22. M

    At 10mph+, my eMTB starts LOUDLY wailing like a banshee...

    Not sure if anyone has had this problem--when I hit about 10mph+ my board starts making a fairly loud wailing sound, getting louder with more speed. It sounds like resonance going through aluminum plate, if that makes sense--I don't think its the motors per se. There are a couple things that are...
  23. M

    nice cheap BRIGHT headlamps...

    So I got one of these, I think I'm going to get another for dual mounted headlights. $10 each http://www.ebay.com/itm/2000Lm-LED-headlamp-XML-T6-headlight-Bike-Bicycle-Light-3Modes-USB-5V-flashlight-/321796686965?
  24. M

    Shorter board=tighter turning?

    I'm trying to work it out in my head--if the trucks are closer together/board shorter, will it turn sharper?
  25. M

    Punch Control ESC setting?

    Sorry to repost this question, I think it got buried in my last post. What exactly does punch control do (I know generally what it does, smooth out acceleration "off-the-line") and what setting do you guys use (0-100%)? I have these:
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