Search results

Date Relevance Most replies

  1. H

    Sur Ron: street legal vs "derestricted" vs "X" - acceleration?

    Hi, 1) Will the street legal get better acceleration (from stand still) if derestricted, or is it only a top speed derestriction? 2) Do the street legal and the "X" version share controller? If not, will the street legal get better acceleration if fitted with an "X" controller? 3) I have...
  2. H

    LiFePo4 starter battery BMS with only 2 leads?

    This is interesting. Conclusion is: I need a low voltage cutoff. Either a stand-alone LVC, or a BMS which include LVC functionality. Current wire harness have 3 cables: - Positive - High amp cable straight to starter motor (60-70A peak during crank, 20A continious) - Positive - Low amp...
  3. H

    LiFePo4 starter battery BMS with only 2 leads?

    Thanks buddy, I wasn't even sure those existed, what term should I search for to find them? Any actual item suggestions? I need 100A I think.
  4. H

    LiFePo4 starter battery BMS with only 2 leads?

    Hello, I previously did this for my 400cc single cylinder motorcycle and it worked great: 4s A123 26650 No BMS I just dropped it in, and it worked great, cranked it like nothing. I now need for my small 70cc. Problem: It is not uncommon for old scooters to have "leak" short circuits that...
  5. H

    Thread for new battery breakthrough PR releases

    To clarify, I get the feeling this is a vapor ware startup, things don't add up. I wish I am wrong.
  6. H

    Thread for new battery breakthrough PR releases

    I really wish I am wrong. But tell me why this sound wrong: Are you telling me, that a small company from nowhere asking consumers for up-front $10,000 will deliver what the LG/Samsung cannot, after have been working on it for years pushing billions and billions in R&D? If they had working...
  7. H

    Super glue nickel strips to 18650?

    This makes Sense. I Guess you can use multiple of the thin wires to spread out current/heat if you are worried. One thing I tried but my soldering iron too weak/broken, to pre solder the battery as well as nickel, then put the two together,heating nickel from above till they merge. Didn't work...
  8. H

    Super glue nickel strips to 18650?

    Tldr; Can you adequately reliably superglue nickel strips to poles to make battery pack? Bear with me, novel mood, so bare with us: In my possesion: 100% lack of spot welder and equal amount of patienceBroken regular welder from around ww1 (seriously, bakelite, no components, directly to...
  9. H

    Run motor with insufficient amp batteries damaging?

    Gool Gool guys, interesting discussion! I made some more research: Hard to find 4s bms with 200A+ My 100A BMS will take 150A burst Some commercially starter batteries have these a123 26650 lifepo4 cylindrical cells without bms Opens up discussion - maybe bms not needed? they wont unbalance...
  10. H

    Run motor with insufficient amp batteries damaging?

    Thanks fechter! Ok, so I hook up A123 cells with 100A bms board, and it should be good as replacement for short bursts?
  11. H

    Run motor with insufficient amp batteries damaging?

    Correct! I want to use this as a learner project while also replacing lead for better alternative.
  12. H

    Run motor with insufficient amp batteries damaging?

    Thanks drunk - what kind of current limiting device would be good here, while being reliable and keeping cost minimal?
  13. H

    Run motor with insufficient amp batteries damaging?

    If you have 200A capable motor but only 100A burst/70A sustain batteries and 100A bms - will you risk damaging batteries and or bms, or will motor only get 100A? Have 4x A123 cells 70A rated 200A burst, with 100A bms. Will connect to motorcycle starter motor which is somewhere between 70-200A...
  14. H

    Thread for new battery breakthrough PR releases

    I was looking for such a forum where one can post news like this and discuss it, but found none. I only found Battery Technology.
  15. H

    Thread for new battery breakthrough PR releases

    Excerpt: The university’s researchers found that lithium ion batteries, commonly used in phones and electric cars, as well as the rechargeable sodium-ion units, make use of organic electrolytes to facilitate the flow of the electrical charge. The presence of lithium salts and solvents in the...
  16. H

    BMS selection - protecting DIY battery pack from overcurrent?

    Want to make a 12v starter battery for motorcycle, for fun. Starter motor can draw 200A (CCA in sla terms). 100A is enough to start engine, so I am aiming at 100A to keep cost below $60-80 in total. I want reliable lifepo4. Seem like 4s1p A123 cells peaking 100A is most reliable choice. They are...
  17. H

    This might be a great donor car model

    So I just read that cars with rotary engines/wankel engines require a lot of maintenance and break down a lot. Making the market full of good condition "useless" cars. Useless unless you want a perfect condition car, without ICE engine, for peanuts. Cool model Mazda RX8, I Googled "Mazda rx8...
  18. H

    Easy questions - fun ICE motorcycle starter battery DIY

    Thanks kdog! Thanks for suggesting another method - so I could get these: https://bmsbattery.com/ebike-battery/405-4s-lifepo4-bms-for-4-cells-in-series-battery.html https://hobbyking.com/en_us/zippy-flightmax-4200mah-4s1p-30c-lifepo4-pack.html alternatively 4x these...
  19. H

    Easy questions - fun ICE motorcycle starter battery DIY

    First project to learn make battery packs. I'm want to tinker together a simple replacement for 12v 5Ah SLA motorcycle starter battery using 18650, bms and vruzend becuse i dont have spot welder. Can solder but I suck big time. Starter motor is ~400w - calculating 600w for margin/light bulbs...
  20. H

    Battery Cost

    That's about half price compared to Europe, which might make things more understandable. http://www.globalpetrolprices.com/gasoline_prices/
  21. H

    Thread for new battery breakthrough PR releases

    The regular hype bullshit or the real thing this time? "Graphene batteries may slash your phone recharge time to 15 minutes" http://www.digitaltrends.com/mobile/dongxu-graphene-battery-pack-15-minutes-recharge-news/
  22. H

    Honda Ruckus conversion plans..

    Ruckus is ~3kw, 50cc drivetrain will not handle this power according to previous builder who tried a 80100 motor (7kw) scooter conversion with a dream to manufacture conversion kits. His bottom line was he had to scratch the idea - drivetrain too weak. Not sure it was belt, clutch or gears. Even...
  23. H

    Charge batteries only to 80% = 4x more cycles?

    Is this correct? If it is, it should be a good way to increase battery life - add 25% energy into your pack and set charger to 80% = profit? "The battery is rated for 1200 cycles at 0-100% charge until it reaches the 80% of the capacity or 5000 cycles when used 0-80% charge." Source...
  24. H

    New ebike/motorcycle/cross?

    Price is nice! Anyone have any info on these? Seem solid! What motor/controller - do we recognise it? Is the bike just a branded chinese product? http://freerider.kuberg.com/
  25. H

    Improvements to forum

    ES is great. It have grown fast and some parts of the forum which worked great for a small number of users and posts, have now gladly grown larger and outgrown its flat layout. Some much needed reconstruction would improve it, making it easier for people to discuss, share and read information. I...
Back
Top