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  1. RVD

    18650 fire!

    in the end, the fire was put out simply with water. i was not home so my wife ran over with water and it put most of it out almost immediately but there was a lot of smoke. she then took a wet towel and placed it over the battery. she was freaking out because there was so much smoke and she...
  2. RVD

    18650 fire!

    I didn't actually know if it was dead. I pushed the button with the leds and it was just down at the bottom light. Since it had been so long since I had last charged it, I guess I was thinking (hoping) that it had been sitting at 3.7v. I was just being lazy...I have multimeters somewhere but...
  3. RVD

    18650 fire!

    ok, i think i get it. i basically got one of those hailong hardpack batteries on aliexpress but the fact of the matter is that in korea (where i live), i can't go down to a local ebike store and buy a battery. they all end up ordering from china. should i just buy from one of the usa guys...
  4. RVD

    18650 fire!

    Hi everyone, it's been a long time since I've been back here. Quick summary...I was active in here way back in the day when I was building electric bikes, playing with various battery technology (lipos, etc.), etc. A few years ago I moved overseas to Korea and brought some of my bikes with me...
  5. RVD

    Samsung Note 7 fires

    like most of you, i ride my bike a lot (commute daily). i would honestly say that 90% of the people on the road are using their phones. most of my route is a bike lane but it's scary sometimes since you know they take their eyes off the road a lot. as for this phone, since it seems limited to...
  6. RVD

    motor started locking up, vibrating?

    good advice! i have one of those pointy tip ones and it was a pain getting the solder to flow.
  7. RVD

    motor started locking up, vibrating?

    i soldered 4mm bullet connectors today and it seems to work well! i suck at soldering but i got it done.
  8. RVD

    motor started locking up, vibrating?

    ykick, i think i got started with anderson power poles way back in the day through your videos. is there any standard on gender for the motor side vs controller side? i'm not sure why but this stuff always annoys me because i almost always get it wrong. female on controller and male on motor...
  9. RVD

    motor started locking up, vibrating?

    thanks amberwolf! yeah, i probably got my wire terminology mixed up. the 5 wires seem fine but i'll put in some new connectors for the 3 wires and see if that fixes this at least temporarily. i'll also look at using some other connectors. i don't want to solder them together because if i...
  10. RVD

    motor started locking up, vibrating?

    I have a fat bike with a MXUS 3000 watt hub motor. It was working well but on my last ride, I ran into a problem. I live on the top of a pretty big and steep hill (around 10-15% grade) but it's relatively short (maybe 200 meters or so). Most hub motors have trouble going up but my bafang 750w...
  11. RVD

    240v outlet

    Quick update. I ended up going with #2. I bought a L6-20 plug, chopped off the existing chinese plug and found 3 wires - yellow w/ green stripe, brown, and blue. Some searching around on the internet basically came to a consensus that I should do the following: yellow w/ green stripe ->...
  12. RVD

    240v outlet

    ok i'll do #2. thanks for the advice folks! amberwolf, glad to hear about the rebuild. RVD.
  13. RVD

    240v outlet

    I ended up buying this one: http://www.aliexpress.com/item/Micro-pulse-787A-Battery-Spot-Welding-Machine-Recharge-Charging-Capability-Charger-foot-pedal-Butt-Welder-Welding/32570706183.html It's a 787A+ but I'm pretty sure that it's 220v only (that's what the seller said). I read on this...
  14. RVD

    240v outlet

    I did a little more research and it actually comes with a 3 prong plug but it's like the kind used in China/Australia/NZ/etc. It is a 220 version from aliexpress. It also comes with one of those universal travel adapters that convert it to USA 3 prong. Even my basic electrical knows enough...
  15. RVD

    240v outlet

    I have a 240v outlet in my garage. The receptacle is a L6-30r. I would like to buy a 220v tab welder from China. I am assuming that it will come with plugs used in China (the same ones as Australia, etc.) I have been looking for a converter that will convert the Chinese plug to L6-30p but...
  16. RVD

    parallel board malfunction?

    ok cool. it's stored in an ammo can right now (ventilated can). i'll probably just toss it. it's a 4s pack so i'd be salvaging it to a 3s pack at best and simply not really worth my while. i don't know if one cell really got to 0 and another got overcharged to 7+ volts but that is what the...
  17. RVD

    parallel board malfunction?

    i finally brought the bad battery home last night and did some analysis. this is battery #1 so the one that i plugged in first...it was fine when i plugged it in. when i plugged in the 2nd battery, it started to spark, etc. so i pulled #2 only to notice that #1 also came out with the burned...
  18. RVD

    parallel board malfunction?

    i have been using this board for about a month without any problems. i plugged in the main charging leads first (3 batteries) and then started plugging in the balance leads. the first balance lead was fine. the second balance lead is when i started to hear it clicking and burning so i...
  19. RVD

    parallel board malfunction?

    hey dogman, thanks for the thoughts. really puzzling. I have done a lot of stupid things in my day including trying to hook up balance plugs in parallel while the mains were in series. The first time I did that was about 4 years ago and I was puzzled but I know now to look out for that...
  20. RVD

    parallel board malfunction?

    so, i was getting my charger set up to charge 3x4s 5ah turnigy lipos. i usually use a parallel charging board. it's a cheap board that i got from hobbyking last year. i don't use it that often but have been using it for the past few weeks and it seemed to work well. it's a 6x4s parallel...
  21. RVD

    bbs02 steep hill best practices?

    the internal gear hub is a shimano nexus 8. it came with the bike (uptown breezer 8). i do think the bike can probably make it up the hill in gear 1 without me pedaling. i do feel resistance when i pedal though. i usually bike up at gear 2 these days and i do help out by pedaling. last...
  22. RVD

    bbs02 steep hill best practices?

    I don't have a temperature gauge but when i put my hand to the motor just after climbing the hill it's barely warm (i can definitely keep my hand there forever). i have an internal gear hub so the chain line is not an issue for me. i didn't change out the front chainring but i did change out...
  23. RVD

    BBS02 750w on 52v 18650?

    ok i'll try this on 14s lipo first to see how performance it is before building the 18650 pack. i just use normal turnigy 20c lipos. i know that the c rating is grossly overrated but even if i only run some small 5ah batteries (so 14s1p using 5ah lipos), would that cause any problems? even at...
  24. RVD

    BBS02 750w on 52v 18650?

    I am thinking of building a new battery pack for my BBS02 750w. It is currently set for 48v which all I think means that it has a LVC set for 41v. I can look into changing this or I don't care...I always monitor my own voltage usage with a watt meter on my bike anyway. I am currently using...
  25. RVD

    bbs02 steep hill best practices?

    Well, it's March so my Nissan Leaf is gone and I'm riding my bike full time to/from work. I ride up this massive hill every day coming home and the BBS02 has been performing beautifully! The bike is kept relatively light because I'm using 12s1p turnigy lipo (44v 5ah). I'm using 3 X 4s 5ah...
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