Search found 29 matches

by NaturalPath
Apr 08 2014 4:43pm
Forum: Battery Technology
Topic: EM3ev charger for 36V 13.8Ah battery
Replies: 17
Views: 1643

Re: EM3ev charger for 36V 13.8Ah battery

Let's not forget that not all 18650 cells are 3.6V, some are 3.7V which is what Paul uses to calibrate his chargers, thus the 42V full charge. The 3.6V cells should only be charged to 41V in a 10S configuration to be fully charged. I asked Paul if he could lower the percent charges on that switchabl...
by NaturalPath
Mar 21 2014 8:18pm
Forum: Battery Technology
Topic: Homemade Battery Packs
Replies: 1627
Views: 435159

Re: Homemade Battery Packs

I think I remember reading somewhere that the self-discharge rate for these type of cells is about .01V per week, so I'm wondering how, after months, you would still have cells reading 4.20 unless they were over-charged to begin with?
by NaturalPath
Feb 20 2014 10:37am
Forum: Battery Technology
Topic: A No Solder/Weld 18650 Build
Replies: 53
Views: 9153

Re: A No Solder/Weld 18650 Build

:D Well, I wouldn't say "bemoaned". Just made an observation. Another suggestion might be not to have both sides of the pack connection panels 'fixed mounted'. I'm working on a way to float the top panel using large rubber bands, made with tire tube material. I've found that this material really hol...
by NaturalPath
Feb 03 2014 7:11pm
Forum: Battery Technology
Topic: A No Solder/Weld 18650 Build
Replies: 53
Views: 9153

Re: A No Solder/Weld 18650 Build

I totally hear ya snath. I spent 35 years designing and building power electronics as a job, and many times I had to 'fly by the seat of my pants' so to speak. To this day, even though I only have hand tools now(no electric tools) and I live in an apartment, I still find ways to build the things tha...
by NaturalPath
Feb 03 2014 5:51pm
Forum: Battery Technology
Topic: A No Solder/Weld 18650 Build
Replies: 53
Views: 9153

Re: A No Solder/Weld 18650 Build

Dogman, inflatable devices would not work, since inflation pressure will change with temperature. spinningmagnets, I've tested some closed cell foams, and they will retain an indent after pressure is applied for a certain amount of time. It's very hard to find any kind of foam that will not have som...
by NaturalPath
Feb 03 2014 11:31am
Forum: Battery Technology
Topic: A No Solder/Weld 18650 Build
Replies: 53
Views: 9153

Re: A No Solder/Weld 18650 Build

I'm working on a similar method myself, although my method is much simpler than yours. One variable you might want to consider is the material that you're using as your 'compression blanket'. Most types of foam/rubber have a 'memory', and after being compressed for a certain amount of time, will tak...
by NaturalPath
Jan 10 2014 3:17pm
Forum: Battery Technology
Topic: Homemade Battery Packs
Replies: 1627
Views: 435159

Re: Homemade Battery Packs

DrkAngel wrote:
NaturalPath wrote:Hello DrkAngel;
Balance charging 5s at a time, (iMax B6?), might seem advisable for initial charges, but it gets old fast.
Okay, I understand.
by NaturalPath
Jan 05 2014 5:20pm
Forum: E-Bike General Discussion
Topic: New Ebiker
Replies: 25
Views: 2031

Re: New Ebiker

Yep, you're right Leftie, at that time, after checking the prices of lithium battery packs, I was thinking that I had no choice but to keep using the SLA's, and I still intend to use them. However, after doing a lot of reading here, I saw that I could build my own lithium pack much cheaper. Even if ...
by NaturalPath
Jan 05 2014 12:21pm
Forum: E-Bike General Discussion
Topic: New Ebiker
Replies: 25
Views: 2031

Re: New Ebiker

Yep, 88 lbs, but it should be a few pounds lighter once I get the lithium in there. I'm only 150 lbs anyway, and the bike is rated for 300lbs load, not that this rating means much, just like the rating for a range of 50kms, all downhill I imagine. :lol:
by NaturalPath
Jan 05 2014 10:16am
Forum: E-Bike General Discussion
Topic: New Ebiker
Replies: 25
Views: 2031

Re: New Ebiker

Thanks for the tips Leftie, I haven't really had this ebike out, since I got it just before the winter set in, but I will be using the SLA's when spring arrives. Right now, I have them inside, and I'm checking them every now and then to make sure that they are fully charged. The problem is that the ...
by NaturalPath
Jan 03 2014 1:44pm
Forum: Battery Technology
Topic: Homemade Battery Packs
Replies: 1627
Views: 435159

Re: Homemade Battery Packs

Thanks very much DrkAngel. I'm sure there will be a learning curve doing this, but I'm willing to learn, and the cost fits my budget. Again, I very much appreciate all the info you've posted on this subject, it would have been much more difficult without that. Unfortunately, the cost for shipping th...
by NaturalPath
Jan 01 2014 12:55pm
Forum: Battery Technology
Topic: Homemade Battery Packs
Replies: 1627
Views: 435159

Re: Homemade Battery Packs

Hello DrkAngel; I am about to undertake the building of a laptop cell battery pack to replace the existing SLA's in a used ebike that I recently acquired http://endless-sphere.com/forums/viewtopic.php?f=3&t=54489 First, I want to thank you for making all this information available, because money is ...
by NaturalPath
Dec 14 2013 10:21am
Forum: Battery Technology
Topic: Good Batteries?
Replies: 91
Views: 7729

Re: Good Batteries?

It's coming though, the 5 ah lifepo4 pouch has already been passed over for limn types. The big problem, is that we don't all have the cash for better cells than china made. That's why I'm currently running nothing but the most horrible hobby lico I could get. It's not what I want, but more like wha...
by NaturalPath
Dec 10 2013 6:44pm
Forum: Battery Technology
Topic: Good Batteries?
Replies: 91
Views: 7729

Re: Good Batteries?

"Bottom line, it's very very important to tailor your battery choice to your exact needs, and your exact motor system. A mismatch can either make the bike an un ridable crashmobile, or murder the battery in weeks." I do understand this dogman. However, there seems to be many opinions on what constit...
by NaturalPath
Dec 10 2013 2:49pm
Forum: Battery Technology
Topic: Good Batteries?
Replies: 91
Views: 7729

Re: Good Batteries?

Nickel Iron has the longest life time of 50+ years and is the most reliable battery. Not long ago, a large bank had been in use for ~100 years someplace I don't recall. Then there's lithium titanate, good for 20+ years and 9000+ cycles. And then there's what I use, rc lipo (LCO). The smallest light...
by NaturalPath
Oct 24 2013 10:24am
Forum: E-Bike General Discussion
Topic: New Ebiker
Replies: 25
Views: 2031

Re: New Ebiker

That's a good point amberwolf, being able to take the rear wheel off that is. I never considered that when I soldered some of the wires together, however, I have had the rear wheel off already, and I didn't have to disconnect any of the plugs to do so. When I removed the plug and the bullets to sold...
by NaturalPath
Oct 22 2013 1:29pm
Forum: E-Bike General Discussion
Topic: New Ebiker
Replies: 25
Views: 2031

Re: New Ebiker

Thanks again John, I am definitely thinking along the lines of hard wiring, instead of connectors. Like you say, I probably won't be taking these wires apart too often, so the plug is just taking up space. I hadn't even gotten to the point of considering alternate battery options, such as building m...
by NaturalPath
Oct 22 2013 1:20pm
Forum: E-Bike General Discussion
Topic: New Ebiker
Replies: 25
Views: 2031

Re: New Ebiker

Thanks amberwolf, you've given me a lot of options that I would have been hesitant to consider. I had no idea that these types of connectors were frowned upon for this type of use. I was considering bullet connectors but, like I mentioned before, I can see some heat fatigue in 3 of the bullet connec...
by NaturalPath
Oct 22 2013 10:00am
Forum: E-Bike General Discussion
Topic: New Ebiker
Replies: 25
Views: 2031

Re: New Ebiker

Here is a picture of a molex plug that has suffered some heat damage. These wires look like the mains coming in from the battery to the controller. I'm wondering if I should look for an exact replacement for that molex connector, or should I just find another connector that will work? These are pret...
by NaturalPath
Oct 21 2013 8:48pm
Forum: E-Bike General Discussion
Topic: New Ebiker
Replies: 25
Views: 2031

Re: New Ebiker

I hear ya John, I may do some rewiring during the winter months. It doesn't make sense to me that the wires coming out of the controller are probably around 12ga. and, after the bullet connectors, they turn into something like 16ga, If anything, I will make these lines all 12ga, if they will fit thr...
by NaturalPath
Oct 21 2013 12:35pm
Forum: E-Bike General Discussion
Topic: New Ebiker
Replies: 25
Views: 2031

Re: New Ebiker

Thanks amberwolf, the wires, themselves, showed no sign of overheating, and the wires coming out of the controller side were much thicker than the wires going to the motor. However, I wouldn't say that there was a total meltdown, it just looked like they suffered some heat related deformation. There...
by NaturalPath
Oct 19 2013 1:26pm
Forum: E-Bike General Discussion
Topic: New Ebiker
Replies: 25
Views: 2031

Re: New Ebiker

Thanks amberwolf, I would be completely happy with 20mph, which is, in fact, the highest legal speed limit for an ebike here in Ontario, without a license. I also believe that there may be a limiter built into the controller that will restrict these ebikes to that speed. However, I'm not interested ...
by NaturalPath
Oct 19 2013 12:04pm
Forum: E-Bike General Discussion
Topic: New Ebiker
Replies: 25
Views: 2031

Re: New Ebiker

Dogman, your instincts were right, this is indeed a brushless motor, with 8 wires going into the axle. I've opened up the motor to check the condition, and it looks brand new in there. I don't think I'll need to do anything inside here for now. Take a look at the pics. If anyone can tell me, from th...
by NaturalPath
Oct 18 2013 3:32pm
Forum: E-Bike General Discussion
Topic: New Ebiker
Replies: 25
Views: 2031

Re: New Ebiker

Also, I haven't seen much mention of using a small, one wheel trailer as a means to carry extra batteries. I know it means extra weight, but I'm wondering if the trade-off might be worth it. Anyone out there doing this?