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  1. S

    Questions about shipping large quantities of laptop batteries - 18650

    So I've got hundreds of lbs of batteries from retired laptops (cells have not been removed from the battery packs) from a local business, maybe somewhere between 50-100kwh worth. I built an awesome ebike battery with some which looks like it will last me a decade, but I have an insane amount...
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    Video of ebike collision - be safe out there!

    https://www.youtube.com/watch?v=5WA974Csaus I'm sharing this video of an accident I was involved in a bit over a year ago to hopefully help others avoid similar situations. Thankfully the driver stopped and my injuries where minor, cold temperatures meant I was wearing several layers, the road...
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    Uses for a giant transformer?

    Probably not applicable to ebikes so much, but this seems like the right place to get some direction. I acquired this massive transformer from a new (but sitting on a shelf for years) 5KV battery backup supply that was being thrown out. It probably weighs close to 30lbs. My electronics...
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    How do I figure out shunt value for my CA?

    I recently got a CA v3 for my bike (DP type even though the controller doesn't have a plug, not a big deal, just made the connections myself). I need to input the controller shunt value so I can get an accurate amp draw reading, but I don't know what that value is and my googling on figuring...
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    Finished bike - 2KwH 18650 battery with pics

    Bike: Diamondback Response SE Motor: Yescomusa 48v 1000w Controller: Stock controller (I remember someone mentioned these are 30a) Battery: Used laptop 18650's - 20p14s total (2 20p7s packs) Top speed: 34mph / 55kmph So this has been a work in progress for a couple years. I started out loading...
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    Solderless 18650 pack - looking for feedback

    This is a simplified design based off the other solderless packs I've seen here, similar to the one Snath posted here a few years back. The block shown will be 24p3s, going to hopefully build 4 of these which fit flat in my panniers for a 48v motor. The brackets are sandwiched between 1/4" PVC...
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    18650 charging/discharging system - share yours!

    As someone who wanted to go with the "used laptop battery" route due to having a good source of batteries I recognized how tedious it is individually test the hundreds of cells I have, in fact if I did have to do them one at a time I would have given up a long time ago. So here are some jigs I...
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    Proper voltage for 18650 battery build?

    I'm in the process of building an 18650 battery pack for my 48v 1000w hub motor. The batteries are used laptop batteries, I've tested them all and I'm working on the final configuration of the pack. I built a triangle that can fit a max of 185 batteries so my question is this... I can either...
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    Charging question - not reading voltage correctly?

    Just a little background, I'm using a Thunder 1220 charger and I'm working with used 18650 laptop cells (in this example, working with a single cell), I'm also using a Fluke 117 multimeter to monitor the cell. When I first turn the charger on the voltage read by the charger is 3.71v and the...
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    Recommendations on voltmater/ammeter for daytime riding?

    Yes, I know the cycle analyst is the way to go, but I'd like to hear about other options available that aren't $150. I'm just getting started and all I want to see is volts/amps at the moment and I figure that can be done at 1/10th the cost. I'm going to be running a 1kw yescom...
  11. S

    18650/charger questions

    So I'm starting to charge 18650 cells that I've scavenged and need some feedback. I purchased a Thunder 1220 charger to use, I set the cell voltage to 4.2 (cells are in the 3.7 range). I put 10 cells in parallel to speed things along and apply only .5 amps, which is what... .05c? However the...
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    Disc brakes impossible?

    So I seem to have a spacing problem with my disc brakes. Where the disc attaches to the adapter and where the caliper are there is a 10mm gap. There is a little aluminum spacer that goes over the axle bolt, I could cut that down a little to move the fork in... but the body of the caliper is...
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    18650 testing - help me speed things up

    So I've got a large amount (150+) of 18650 cells that I need to test capacity so I can pair them up for my first 18650 pack. I've been doing these 1 at a time so far (charging and discharging at .3c) with my Thunder 1220 charger, ultimately there will be 12 strings in series which is why I...
  14. S

    Disc brake adapter?

    My bike has a disc brake caliper on the rear wheel but the motor did not come with an adapter to attach the rotor to. I've looked at some old threads here and all the sites these adapters were sourced out of are gone or out of stock... arrgg! I read that spacing can be an issue, so let me know...
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    Help me design/build a 18650 battery pack

    Help me design/build a 18650 battery pack So I finally got my 48v 1kw motor working, it's one of the yescom kits. I've been using about 40lbs of SLA's just to try things out, it gets me up to 25mph and it's fun but the range is dismal and the weight is far too much. I've been collecting...
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    Fuses and amp monitoring

    I'm going to be using a 1kw 48v yescom kit and I believe the controller is 30amps. After searching the forum there seems to be a lot of options for fuse types. The blade fuses look pretty convenient and I found some on ebay that look like they would fit the bill -...
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    Troubleshooting... am I on the right track?

    So I received a 1kw 48v kit (I believe it's of the yescom variety) from my favorite cousin the other day. He mentioned it needed some work and I see why, the wiring that enters the hub motor was chewed up but fixable, everything was exposed. I pulled the cover off and pulled some clean wire down...
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    18650 pack - am I doing this right?

    So I'm starting to learn how to build a battery pack from laptop 18650's, I'm still new to this and I want to make sure I'm doing it correctly and safely. The enclosure material is 1/4" PVC scrap I'm getting from work, the reddish material is copper that I'm hammering out from some 1" copper...
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    First build - show me the way of the e-bike!

    Hello all! Building an e-bike has been on the back of my mind for years now. I feel like it's time to pull the trigger and make it happen! I have a basic understanding of the technology involved but I'm constantly reading to get a better grasp... especially regarding the battery systems. I'm...
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