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  1. CUDAcores89

    How to charge a 72v battery?

    Question says it all, how do I charge a 72v battery I am building? I am planning to build a 72v battery out of some samsung 20Q cells from power tool batteries that I got a really nice deal on locally, Only $1 per cell. Only issue now is how to charge it? Currently I run a 52v battery with no...
  2. CUDAcores89

    Looking for 48-72v brushless controller with many features

    Hey folks, I need help finding a new controller as my old one died. Well what really happened is my Greentime 48-84v brushless controller makes a bunch of horrible vibrating noise on my hub motor now. So I believe that one of the phases is dead. I have a cheap $10 36-48v sensorless controller I...
  3. CUDAcores89

    Hub motor makes squealing noise at about 15mph

    well I suppose the good news is I no longer rely on my bike for transportation anymore. I'm going to a different college and will be living in the dorm rooms so I can just walk everywhere on campus. This bike has now kind of just turned into a joyriding vehicle so stuff can break without me...
  4. CUDAcores89

    Looking for rear Hub motor for hitting 40mph on flats

    Since I currently ride a cheap ebay hub motor, I am currently shopping for a bigger hub motor that can get me to 40mph. I currently weigh 150 pounds and my bike usually comes in at 50 pounds. My riding style is mostly flat road with occasional small hills between 0-1% grade. I currently run...
  5. CUDAcores89

    Thermal paste on hub motor windings. Dumb idea or dumb idea?

    I had this idea today about how to cool my hub motor, but it sounds pretty stupid and I see several drawbacks, but I wanted to know what endless sphere thought. I currently run a 9x6 generic ebay hub motor at 1500w continuously and i'm trying to see if I can run this thing at 3000w. Nearly all...
  6. CUDAcores89

    looking for a 72v BMS that isn't crap, or maybe do something else?.

    So in my journey now to take a "500w" ebay hub motor and run 3000w through it (motor did 1500w just fine with everything stock), I have decided I will need to upgrade my battery pack to 72v. The battery pack will be a 20S 8P 18650 battery pack made from tested power tool cells. On the hub...
  7. CUDAcores89

    What kind of hub motor is this?

    Today I decided to open up my "500w" ebay hub motor to coat the stator in some SPRAYON EL601 to waterproof it. I live in Michigan, so water getting into the motor is a real concern. But while we are in here, I would like some feedback about what kind of motor this actually is. Is this a 9C...
  8. CUDAcores89

    Enabling regen on 48v 38A ebay controller

    Hey folks. I recently bought a 48v "800w" brushless controller from ebay and I am trying to figure out how to enable regenertive breaking on this controller. I scoured the forums here but I couldn't find any information on how to do it for my particular controller. Bike specs: 48v 1000w ebay...
  9. CUDAcores89

    Upgrading to disc brakes. Buy disc brake compatible wheel, or entire bike to pull wheel from?

    Hey folks, i've just have a question regarding an upgrade I want to do to my electric bike. Background: I ride 16 miles to and from my university 5 days a week through rain, snow, puddles, you name it. Ever since getting into the e biking world, I love riding my bike every chance I get. I...
  10. CUDAcores89

    The poor mans cycle satiator

    Not sure if anyone has done something like this, but I thought I would share how I charge up my ebike battery at work quickly and cheaply without spending $100+ on a fast charger that still has lots of features found on super expensive chargers like the cycle satiator. Edit: Obviously this has...
  11. CUDAcores89

    How did you guys get into Electrifying bikes/scooter/ect

    For me it started in 2012 when I wanted a fun toy to use over the weekend. Nothing actually came of it because I just didn't know enough about batteries and motors yet, but I did do some research. I'm been much more electrically inclined throughout my life, so I know I didn't want to go the gas...
  12. CUDAcores89

    Found some A123 AMP20M1HD-A cells at a scrapyard today. How to take care of them?

    Hey folks, i'm building a new electric bike to use to commute to and from where I work every day. I need to build a new battery for the ebike of course, since my old one was sold off to the new owner (after I installed a proper BMS of course, too many idiots out there). The best place I know...
  13. CUDAcores89

    Looking for "new" used bike for electric conversion

    Howdy folks, I don't come here often if you can tell by my post count. A few years ago, I built an electric bike out of a 1996 Marin mountain bike I got off of craigslist and used it to commute to where I work. I used one of those cheap 1000w front wheel kits from ebay and it worked great. In...
  14. CUDAcores89

    Looking for a way to fast-charge my ebike pack

    Hey folks, I haven't been on here in a really long time but I decided to stop in because well, I have a problem. Currently I own an ebike. I ride the bike to and from where I work every day. The ride itself is a round trip of 20 miles. My system bike is a 1000w front-wheel drive I bought off...
  15. CUDAcores89

    Just a strange thought

    Everyone on here that has built or owned a battery means that at the very least we can all agree on one thing... Heat is bad for the lifespan of lithium-ion. Heat also limits the amount of energy that can be discharged from a cell. Once a li-ion cell reaches a specific temperature, it will...
  16. CUDAcores89

    My idea for a long-lasting, fast accelerating ebike battery

    So far I have been enbarking on a quest to build an ebike battery that has all of the following parameters. My system is a 36v 12.5A ebike rear hub motor I purchased from ebay 4 months ago and the system has been working really great. Although the problem is my battery is built from salvaged...
  17. CUDAcores89

    GWL power, reputable or not?

    If you check out my old thread: https://endless-sphere.com/forums/viewtopic.php?f=14&t=85315&p=1247386#p1247386 I have decided I am going to build a battery pack out of A123 cells because of their superior cycle life to other cells. After looking around, I couldn't find a great price on A123...
  18. CUDAcores89

    Lowest cost per cycle ebike battery

    About 6 months ago I built an ebike and it has been working great. I use the thing every single day to get to and from work. So far I have put about 2000 miles on an ebike battery I built from "dead" laptop batteries and I have started to notice that the cells sag in voltage much more than a...
  19. CUDAcores89

    DIY Ebike battery quite warm under load

    I finished building my electric bike a couple of weeks ago, and I have been using it to commute to and from where I work for the past couple of weeks. I actually built the battery myself out of "dead" laptop cells as many others have done. My battery is 10S5P 36v 10AH for a total of 360...
  20. CUDAcores89

    Cheap ebike for electric conversion

    SO I Decided I want to build an ebike... A couple of details about myself: I am a teenager and therefore am on a budget. Currently I drive about 4 miles to get to my job where I work. After realizing how much cheaper it would be to own a bike instead of a car to get places, I was all ears. I...
  21. CUDAcores89

    500w vs 1000w hub motor for city driving?

    I am a teenager and I Recently got a job at mcdonalds, but I only live a couple of miles away, so I decided instead of burning gas up every day in a car I decided I am going to embark on building an ebike. I have just purchased the bike. It is a cheap Giant brand Bike I bought at a garage sale...
  22. CUDAcores89

    Turnigy Accucel 8 vs Hobbyking eco 8

    Long time broswer, but first time poster, here we go. I am building an ebike on a budget. My budget for the entire thing is $600. Anyway so far I have built the battery for the ebike: It is a 14s 14p 48v (true 51.8v) 28AH 1.45KWh battery pack I made form salvaged laptop 18650 cells. I plan...
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