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  1. J

    EM3EV BMS Reset Following Short

    The Andersons on the pigtail connecting the output from my 14S pack (in a backpack) to my BBSHD melted near LVC, resulting in a short. The BMS did its job and cut-off, and the battery takes a charge, but the BMS appears to still be in protect mode. The display will power up initially, but not...
  2. J

    BBS02 Replacement Secondary Reduction Gear

    Does anyone have a resource for a replacement secondary reduction gear for a BBS02? I recently damaged my pinion and gear. The pinion seems fairly easy to come by, but the only place I've been able to find gear for sale (Luna) is backordered. thanks for your help!
  3. J

    Upgrade from BBS02 to BBSHD w/ Samsung 29e Battery Pack?

    I have a BBS02 purchased around 2.5 years ago from EM3EV. The secondary reduction had been making a racket for some time and I finally wrecked the pinion, trashing the secondary drive gear at the same time. Luna sells both parts, but the larger drive gear has been out of stock for ages. First...
  4. J

    BBS02 "Rumbling" Under Pedal Power or Assist

    Hello, My BBS02 (purchased 18 months ago from EM3EV, only around 700 miles on the odometer, S/N 1408237823) has recently began feeling/sounding rough when accelerating forward, either under human or motor power. It initially seemed most pronounced when in lower gears (likely due to the higher...
  5. J

    Just picked up an Urban Mover UM70SX - Any info out there?

    Greetings, First time posting in the E-Skateboard section. I just picked up a 6-7 year old Urban Mover UM70SX with old SLAs. 36V system 800W max supposedly. http://urbanmover.com/products/powerBoards/UM70SX.php I have a couple of 6S 10Ah multirotar packs that I was going to series together...
  6. J

    Strongest 10 Speed Chain for Use with Bafang BBS02

    I just replaced my 9 speed drivetrain with Shimano Zee (shadow+) derailleur, shifter, SLX 10 sp cassette and KMC X10.93 chain. The whole setup rides and shifts like a dream (Shadow+ is the real deal), though after only about 40 miles I broke my first chain (300+ miles on Sram 9 speed chain with...
  7. J

    Upgrading 24V Homelite Mower to 48V

    Starting to think about spring mowing here in the NW. I have a 24V Homelite UT13122 mower with dead SLAs and a missing charger. I also have a 4 year old Ping 48V 20Ah pack that's collecting dust in my garage. From what I've read, this mower can't handle a doubling of voltage, so I figured I'd...
  8. J

    EM3EV charger switch voltage?

    I just received a 50v 14s li-ion battery and charger from em3ev. There were no instructions in the box or on the website that I could find. Can anyone explain the charging voltages for each position II O I ? THANKS
  9. J

    Narrowing a bottom-bracket shell for better chainline (BBS)

    I have a 2006 Cannondale Prophet onto which I plan to install a BBS02 from Paul. It has a 73mm BB shell, so I'm concerned with the chain line being too far out there. I've read a bit about this on the giant BBS thread, but had some questions. I also stopped by a local bike shop to see if they'd...
  10. J

    Charging 14S NCM pack with 16S LiFePO4 Charger

    I am transitioning to a new 14S 14Ah LiNCM pack from my trusty old Ping 16S 20Ah boat anchor. Since the charging voltage is so close (58.8V for 14S NCM; 60-61V for 16S LiFe) is it possible to re-purpose my two LiFe chargers? Can charge voltage be adjusted down to 58.8V? Are there other factors...
  11. J

    Differences between SLAs for Cordless Mower

    I have a 24 volt homelite lawnmower with two 12V 20Ah SLAs that are just about gone. My company installs security systems (among other things) and my security parts distributor carries 12Ah and 18Ah SLAs for security system backup (low current draw - not unlike a UPS). Is there likely a...
  12. J

    IEC C19/C20 use as battery connectors?

    I am researching battery connectors to use in a backpack battery application. I like the idea of a sturdy non-locking connector, so that If I get off (or fall off) of the bike, the two ends will separate without incident. The motor will be the Bafang BBS02 750W mid drive. Max current is 25A...
  13. J

    Slim Controllers from E-BikeKit.com

    I am looking for a compact controller to replace the standard 13A unit that came with my Ampedbikes front geared conversion kit, and just read about E-bikekit.com's new, slim 36/48V 22A controller here...
  14. J

    Advice on Freeride bike for Bafang BBS02?

    I've been combing craigslist for suitable full-suspension all-mountain/freeride bikes that would make a suitable platform for Bafangs BBS02 crank drive. It seems most of the newer frames in this category from the major manufacturers have a swooping (almost S-shaped) downtube that enters the...
  15. J

    Converting from 9-Speed Cassette to 7-Speed Freewheel

    First-off, I'd like to confirm that it's NOT possible to run a 9-speed freewheel with a MAC geared motor in aluminum 135mm dropouts. If this IS possible, please explain. Assuming it's not possible and would have to go to 7-speed, do I simply need to change the shifter to 7-speed, and adjust the...
  16. J

    Adding a LiPo "booster" pack

    I've decided to shelve a new build for this year, so I am looking for ways to squeeze more fun out of my existing ride [Cannondale Bad Boy, Amped (MXUS?) front geared motor, compact 13A controller, Ping 48V 20Ah LiFe battery]. The Ping was more or less rebuilt last year (thanks again for your...
  17. J

    Thoughts on this bike as a conversion candidate?

    I've been combing craigslist for high-quality, (relatively) lightweight full-suspension bikes with somewhat slack geometry and a decent amount of travel. Being a fan of Rocky Mountain (I own one of their steel Blizzard hard tails), this caught my eye...
  18. J

    ATV-Style Thumb Throttle

    Does anyone know a higher-quality, ATV-style thumb throttle available available? The traditional half- or full-twist throttles and twist-style thumb throttles leave a lot to be desired, in my opinion. Paddle-type thumb throttles better track the thumb's range of motion than the twisting variety...
  19. J

    At what voltage should I hit LVC?

    I have a 3 year old Ping 48V 20Ah battery and I'm trying to determine my BMS' LVC point to try to avoid BMS and/or cell damage. I've blown two BMS's after hitting LVC, and replaced a number of bad cells (with the generous help of dnmum) whose failures may have stemmed from these BMS failures...
  20. J

    How many turns is my motor?

    I have a 3-year-old Amped 350W front geared motor (made by MXUS?). i am considering upgrading to a MAC but wanted to know what my current motor is to establish expectations. Current setup: Cannondale Bad Boy, converted to 26", PING 48V 20AH LiFeP04 (approx 3 years old as well). Thanks in advance!
  21. J

    Cheap Folding eBike?

    My Dad recently told me that he was looking into a cheap mid-drive folding eBike from a random junk catalog he receives called Heartland America for $399. You can see it here: http://www.heartlandamerica.com/browse/item.asp?product=iride-electric-folding-bike&pin=145929 He is retired and not in...
  22. J

    Any Battery Repair Experts out There?

    So I think I may have damaged my 48V 20AH Ping. Symptom: won't consistently initiate a charge from my charger. The charger acts as though it is charged. The BMS is a bit charred (and had been so for some time and still worked fine, though the charging FET got really hot during charging). I...
  23. J

    LiFePO4 Motorcyle Starter Batteries from UPG

    I was browsing light bulbs last night on 1000bulbs.com and came across these LiFePO4 motorcycle batteries: http://1000bulbs.com/search/?filter%5Bcategory%5D=2269&filter%5Bchemistry%28text%29%5D=LiFePO4 The are sold as 12V units (for M/C starter duty) and the price seems fair, but the size and...
  24. J

    I think my charger is dying...anyone know a possible fix?

    I have a 2.5 year old 48V Ping w/ the 60V 5A charger that shipped with it as an upgrade. Lately it has been behaving erratically. I'll plug it into the pack and it will start charging for 30 seconds or so, then stop for about 10. Today, it charged, then paused, then charged some more, then...
  25. J

    Alfine Rear Hub - Chain Length/Tension

    So I just had a new wheelset built - front geared Amped motor into Sunrims MTX33 downhill rims, and an 8-speed Alfine internally-geared hub in the rear w/ the same rim. In an effort to gear the bike tall for higher speeds than traditional cycling, I elected to go with a 16-tooth rear cog and a...
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