Search results

Date Relevance Most replies

  1. B

    Ryobi battery Build - Am i ready to test?(update: success)

    There's a new p135 ryobi charger that looks a little better built. It might be a good candidate for conversion depending on how it's wired. Hopefully they'll mark down the older model and I can try to mod it.
  2. B

    What do you think of these 18650's

    I've been playing with these for a few months without any major issues. They are 79$ at my home depot, but can drop even lower. there is a site called slickdeals(DOT)net and people post info about price drops and sorts. At one point they dropped to 25$ for 2 18V 4amp batteries and I jumped in...
  3. B

    Ryobi battery Build - Am i ready to test?(update: success)

    Hey fellow ryoberry user! The 2 banks drawdown equally to within .01 volts of each other. There was one occasion where 1 single 18v self discharged, but I could not pinpoint the problem. I simply mounted the springs more solidly to provide better contact. The batteries didn't need to be...
  4. B

    Taking a chance on Alibaba (K Power battery)

    I'm considering ordering one for a family member, but I have a quick question. When I check the link, it shows ( what I assume to be you) d*******n listed as a buyer of the samsung version. I don't want to make the same error and order the non-samsung version. Could you clarify what went wrong...
  5. B

    Ryobi battery Build - Am i ready to test?(update: success)

    There is a youtube video of the P125 being disassembled. The spring contacts are directly soldered onto the main board. Which means I would need to scrape away traces and solder switch(s) to isolate the charger hardware. It sounds simple to cut 12 traces, but it depends on the layout of the...
  6. B

    Show Us Your Homemade Battery Housing

    Does this Count? I can sew, but only manly,macho and cool stuff.
  7. B

    Ryobi battery Build - Am i ready to test?(update: success)

    There is a site called slickdeals dot net. You can sign up for alerts to ryobi batteries, specifically p122's. I think sometimes with coupons you can get them for 85 to 95$. If you wait, they may go on clearance down to $75, $50, or even $25. There was a ryobi promotion recently at Home Depot...
  8. B

    Ryobi battery Build - Am i ready to test?(update: success)

    mclark999 - I think it should work fine since the pack can do 7.5C which allows 30A. If you can monitor your amps, you should be ok. I had one of the packs lose a connection, which essentially made my pack 54V 4Ah. It got warm and drained pretty quick. Looking forward to your build. dequinox -...
  9. B

    Adopting Power Tool Batteries to Our Broader Uses

  10. B

    Electric bike news source.

    Dogman dan 3000pts for awesomeness. The site has a quite a few links to NYC ebike issues which matter to me. One article even mentions my neighborhood specifically. Thanks for the heads up.
  11. B

    Adopting Power Tool Batteries to Our Broader Uses

  12. B

    Adopting Power Tool Batteries to Our Broader Uses

    http://endless-sphere.com/forums/viewtopic.php?f=14&t=68281&start=25 I made one of these and it works with the stock charger ( just pull them out and plug in ). The specs are in my post and I'll post a how-to guide when I've tested it further ( so far, so good ). The individual packs are are...
  13. B

    powerwheels 18v conversion (works great)

    The wood holder is great so far, but it will fly out if you hit a really hard bump. One popped out at 20 mph when i hit a bump, but they are tough and barely had a scratch. My setup is 3 in series for 54V and then parallel for 8ah, so I haven't had any issues. If you want a pdf of the template...
  14. B

    powerwheels 18v conversion (works great)

    BYqSXt8Z, your posts helped me build my first Ryobi Battery. Maybe I can give something back. The first is reusing the shrink wrap packaging to make a harness, the second one is a wood frame to hold/connect 6 batteries. I think for your kids power wheels, the shrink wrap would hold up fine...
  15. B

    Ryobi battery Build - Am i ready to test?(update: success)

    After re-reading some old threads about ryobi p108's, I realize they are capable of 7.5c which allows 30A. My pack is 54V 8Ah, so it's capable of 60A. The fuse is 40A and I think this leaves a pretty good margin of safety. The range may not be great, but I'm not using this to do a daily commute...
  16. B

    Ryobi battery Build - Am i ready to test?(update: success)

    jssneptune - You might be right about paralleling 3 packs and using the original charging circuit forming a 18v 12AH pack. Some guy made this on youtube: I was also wondering the exact chemistry of the samsung 18650 20Q, if it is similair to Dr. Bass's Konion self balancing type. I've been...
  17. B

    Ryobi battery Build - Am i ready to test?(update: success)

    Sweet ride, dude. I was thinking roughly along the same lines. The idea is to have 3 18v 12AH stacks and then use a factory charger right? Unfortunately I think our 18V 4AH is not set up to balance the 10 cells ( 5s2p ), so 5s6p might not work. The solder tabs are setup like : This guy also...
  18. B

    Ryobi battery Build - Am i ready to test?(update: success)

    jssneptune - read your posts as well, but i couldn't find any info on how you are connecting & mounting your battery. Would you mind sharing some pictures? 999zip - It's not a east coast thing. Honestly, I thought you were a founding member of the ' tingling testicle troops ' who tinker with...
  19. B

    Help with first build

    You're welcome. I have very little experience with ebikes and my skill set is similar to yours. The 10 minute testing I did seems to validate the estimates. However without a cycle analyst ( CA ) or ammeter ( mine has 10A limit), I'm reluctant to confirm real life wh/m. The speed I can confirm...
  20. B

    Ryobi battery Build - Am i ready to test?(update: success)

    parabellum - you're right 60.2V is low. I measured again after I fully charged, 20.9V on each pack and 62.4V for entire set ( ouch). Thanks for the advice about BEMF, I never heard of it till now. The caps are CD288H 63v 470uF and 15 FETs (HY1707 FC837J21). If I blow the caps, I'll eat the...
  21. B

    Help with first build

    http://electricbikerange.info/Electric_bike_range.html I found this searching though the forums. range+ calculator+ Avitt posted the link Re: "Storm" ebike - new fat tire entry input where you are, where to be, what you got and then BAMM!! it tells you battery consumption, avg speed and other...
  22. B

    Ryobi battery Build - Am i ready to test?(update: success)

    Thank you for the kool stop pads tip. I won't be testing anymore til the torque arm & brakes come in. parabellum - I've opened up several ryobi tools and I don't see any lvc circuit, but I could be wrong. The battery itself has some fancy circuits inside that I assumed to be lvc. There is a...
  23. B

    Help with first build

    Sorry about that. I'll try to clear it up. 20-21 watts per mile , so 21w/m 48v x 20ah = 960wh ( I think people measure their batteries by watt hours as well as amp hours ) 960wh / 21w/m = 45.71 mile range, factor in your max 80% and you have a theoretical 36.56 mile range. your commute is 18.5...
  24. B

    Ryobi battery Build - Am i ready to test?(update: success)

    I believe the ryobi's have a lvc built in and I also won't be traveling more than 10 miles RT. My kit is 48v 1000w and doesn't specify the amps, but i'm guessing under 20A. The battery is 3 x 18v in series with 2 sets in parallel giving me 54V 8Ah ( 432 wh). I won't be adding another set since I...
  25. B

    Help with first build

    Hey! I purchased the exact kit you listed. I've installed, and done a quick test run and it is a blast ( ordered tues and got it thurs NJ to brooklyn,NY. I think most ppl on this forum will recommend that you install on the rear if you are new to this. I also have a steel frame and will install...
Back
Top