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  1. T

    I almost burned my condo down today w/ my battery pack

    I got home from work a little while ago and started cooking dinner. I began to smell a very acrid smell, like burning rubber or plastic. The stove was smoking a bit, so I figured this was the culprit. About 10 minutes later, and my eyes are starting to burn from the acrid stench in the air. I...
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    Broken bike, motor acting weird

    The other day, my bike started acting crazy. I was on a ride and the motor went up to max speed with no throttle response. I had to reach into my pack and frantically yank apart some connections to slow the thing down. I've reseated all the connections, and now, it's behaving unlike anything...
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    Testing for bad cells in parallel configuration?

    I'm sure it's here somewhere, but I'm really tied of looking :? I have a batteryspace LiMnNi 36v 12ah pack that stopped working last week. It will actually put out just a little juice, but any significant load, and it cuts out completely. I believe the onboard BMS is tripping because one of the...
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    Power and Control Connector-- All-in-one?

    I'm tired of googling... and I haven't found what I need. Here's the end goal: one plug that connects power and control wiring. The thing is, the power cables are thick and running at 40amps, and the control wiring are teeny-tiny running low loads. I want to be able to connect ONE connection and...
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    Using Right Angle Reduction Gearboxes

    I'm getting ready to build my second ebike-- a full suspension, Astro 3210 powered offroad beast-- and I'm trying to figure out how I'll go about gear reduction. Some of the two stage reduction units on ES like Matt's are gorgeous, but I wonder why we can't use commercially available reduction...
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    LiPo in a Backpack-- Can I make it Safe??

    Hey guys, it's good to be back on here! My next project, which I posted about a while back, involves putting the batteries and controller in a backpack with a tether going out to to the throttle, motor, and lights. This would be for a full-suspension, offroad ebike application. I've been...
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    New ebike Concept: the PowerPack + Hub Motor

    Hey all, I've been off the forums for a while now. fyi in that time I've graduated college, but I've been riding me ebike pretty much every day. At the moment I'm in talks with a local company about developing a product concept that I am REALLLLY excited about, and I'm looking for the...
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    Lowering Voltage, Upping Amps to Get Around Reduction Gears

    I think the title pretty much sums it up. Using an RC motor poses some problems with reducing the RPMs from the motor to the wheel. Is it possible to drop the motor voltage to something like 12 volts, but keep the amperage at something like 100amps? In my mind, I envision a motor that runs slow...
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    Blown MOSFET- Still Works but Jerky

    I was about to start a ride the other day and managed to hit the throttle full-on when the bike was moving backward slightly. Next thing I knew, I heard two pops from the controller and some smoke drifting out of the controller seals :shock: Funny thing is, the bike would still run after the...
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    Replacement for p75nf75 Blown Mosfet

    I blew one of my MOSFETs yesterday- I opened up the controller and the farthest one seemed to have "vented." The writing on the chip says :p75nf75. I have very little formal training in electronics, so would one of you mind steering me to the easiest solution? Do the numbers have any technical...
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    Conductive Glue for Battery Pack Construction

    I had a humbling experience today trying to put together my first battery pack made from 20 matched Konion cells in a planned 2p10s configuration. My soldering skills are... two weeks old. After a while, the super glue on my bench was looking appealing, so put a batter bar between two cells and...
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    Overamping the 9 Continents Kit from 23 to 35 Amps- How To

    I've seen some talk on ES about soldering a "shunt" on pretty much any ebike controller in order to increase the amps that the controller can put out. Today, I'm going to show you how to do it for a 9 Continents kit so that your 23 amp stock controller will now put out around 35 amps. Your ebike...
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    Using the Best Cells Without the CBA II

    I have about 100+ used cells that I scored from a local tool battery service center: about 50 Konions and about 50 Emolis. Some of the packs looked like they were in great condition, thus I think the cells are good as well. Other packs looked like they had been through the ringer at a...
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    A Few Questions to the Experts

    I have been salvaging defective tool batteries from my county's battery service center, so I've accumulated about 40 emoli cells and 50 Konions. I want to build some battery packs out of them, but I'm still pretty new to battery tech and what not. Here are my questions: *What would happen if I...
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    Running my bike on *one tool battery- what gives?

    I received my first Bosch bat836 in the mail earlier today and decided to give it a little test run. I hooked the single battery up to my controller on my bike and started buzzing around the driveway. It worked, but the power would briefly cut out every 5 seconds for a half-second. What gives...
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    Scavenging for Used Battery Cells: My Mission and the Booty!

    I have recently been inspired by some of the posts by Doctorbass in the EV Battery forum. From what I understand, he has been getting A LOT of used and broken Makita power tool packs from some source, and as I understand it, for FREE! The Konion cells in the Makita packs are what I was after...
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    Using the 36v Bosch BAT836: BMS and Theory

    I've been dreaming up a full suspension eBike that is more of an "electric dirtbike." Here are the specs I'm thinking of: Full suspension downhill mountain bike 9 Continents (AmpedBikes) Rear Hub Motor 72 volts at around 10ah I'm looking at the Bosch BAT836 Fatpacks on eBay. The batteries, I...
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