Go Back  Bike Forums > Bike Forums > Electric Bikes
Reload this Page >

Sticky thread for batteries?

Notices
Electric Bikes Here's a place to discuss ebikes, from home grown to high-tech.

Sticky thread for batteries?

Old 10-22-11, 11:31 AM
  #126  
christ0ph
Senior Member
 
Join Date: Oct 2011
Location: currently NYC area, previously, Bay Area
Posts: 501

Bikes: 1974 Raleigh Grand Prix

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
We should be more committed to creating tax incentives for research and development of technologies like this. Companies that develop key technologies and maintain at least 90% of their staffing here, and do their manufacturing (automated is okay) in the US should be able to operate TAX FREE.

Originally Posted by tpreitzel
Axion has been quietly working since 2003 on another proprietary version of lead acid chemistry called PbC:

https://www.axionpower.com/profiles/i...1&s=0&ID=10299

Axion's product has been undergoing real world testing for at least 5 years so it's not simply a laboratory experiment.

I'll guarantee you that lead acid isn't going away as the infrastructure is simply gigantic and well established worldwide. Lithium reserves are limited so we already know that lithium based chemistry is simply transitional to another type of chemistry, e.g. zinc-air.

Also do you know that carbon fiber can act as a battery? Yeah, that's right, we'll likely see structural components consisting of carbon fiber acting as batteries as well... unbelievable where battery technology is headed...

Last edited by christ0ph; 10-22-11 at 11:37 AM.
christ0ph is offline  
Old 12-11-11, 12:55 PM
  #127  
powell
Senior Member
 
Join Date: Aug 2011
Location: Western Canada
Posts: 689

Bikes: E+ kit, BIONX

Mentioned: 5 Post(s)
Tagged: 0 Thread(s)
Quoted: 58 Post(s)
Likes: 0
Liked 10 Times in 7 Posts
I ride my TorceForce ebike on 36V 10Amphour LiFePo from LifeBatt.
LifeBatt are not weak China brands cells, it uses Taiwan-made cells=quality.
Battery cost $750 and it was one of the best spend $750 in my life.
I know what are you going to say - soo expensive????
But it is not your duct tape,patched up, low C rate crap with faulty electronics sold on eBay.
I bougt and installed LifeBatt in June 2008 when odometer on my TF showed 10,500 km, now I got 20,100 km /yes that's over 10,000km ,I ride year round/
Numbers speak for themselves.
I charge LifeBatt twice/day sometimes 3 times a day and ride at minimum 333 days a year - that is say 700 charges a year, means this pack will be charged 2800 times in June 2012!!!
But it is not showing any signes of aging , voltage sags is exactely as it was,
couple of week ago I discharged to 9Ah and it was strong to the end of discharge.
powell is offline  
Old 07-21-12, 11:13 PM
  #128  
Kevin Harvey
Senior Member
 
Join Date: Jun 2012
Posts: 64
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
I buy LiFePo4 cells that screw together & BMS from (not pc capable enough to give link) bms china have accout etc they are the cheapest but one has to be very carefull to order BMS big enough for your motor. They sell a cheap pack but again shift the little thing up to get bigger BMS .
Kevin Harvey is offline  
Old 07-21-12, 11:23 PM
  #129  
Kevin Harvey
Senior Member
 
Join Date: Jun 2012
Posts: 64
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
For lifepo4 battery its imperative to get the long life to have a BMS which has each cell with a signal wire I use 3.3v 12ah cell so for say 24v thats only 8 signal wires ( this called 8 S BMS ) but there again must be say for 500w -700w motor divided buy 24v = ? amps that the size BMS or they go pufffff or cut out up the hill,.
Kevin Harvey is offline  
Old 07-22-12, 08:34 PM
  #130  
ffrost3
Newbie
 
Join Date: Jul 2012
Posts: 3
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Wow you guys have saved me. All of your feedback is so great. I bought an ebike at an auction and the battery was crap and I have been planning on replacing it myself but didnt know where to start. Really glad I found you all!
ffrost3 is offline  
Old 07-25-12, 01:14 AM
  #131  
Kevin Harvey
Senior Member
 
Join Date: Jun 2012
Posts: 64
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
I'm in new Zealand , i ve bought many batteries from a web site named BMS (don't know how to give a link) but they are by the time I get the cells & the right BMS it cost still a lot less than any other site --I am always looking for a cheaper source ,Ive learnt to make my own battery pack which is no cheaper than their cheap pack but realy good ballance for the bike ,i wish i could put picture of them. making sure the BMS is enough for bike motor is something one must be carefull of
Kevin Harvey is offline  
Old 07-25-12, 01:19 AM
  #132  
Kevin Harvey
Senior Member
 
Join Date: Jun 2012
Posts: 64
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
BMS is battery management system with LIFePo4 , no cell can be discharged lower than say 2.6v & no higherthan 3.4 when charged or they stuff it . there are cheap BMS for low wattage motors which will be your first mistake like it was for me ,, get the best & they are lasting .
Kevin Harvey is offline  
Old 07-27-12, 02:35 AM
  #133  
Kevin Harvey
Senior Member
 
Join Date: Jun 2012
Posts: 64
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
https://www.bmsbattery.com/ this is the the people who i've bought many batteries from 7 now buy the cells & BMS to make my own batteries. they are not generous when yuo make a mistake ordering etc but are so far the cheapest i've found -----make sure you get right Amp for BMS as they are small for low wattage & big for big wattage
Kevin Harvey is offline  
Old 07-27-12, 07:04 AM
  #134  
Redstone02
Newbie
 
Join Date: Jul 2012
Posts: 1
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Kevin,

Do you have any performance/charge/discharge data for your BMS battery pack? How long have you had the pack? How many charge/discharge cycles so far? What is your typical discharge "C" rate? What size charger do you use / what is your charge "C" rate?

Sorry, for all the questions. I did check out BMS web site and their prices are good, wonder if their products are too. I've have been looking into Ping Batteries who's prices are a little high but if they hold up longer and have better customer support...

I' looking into a 450 watt / 48 volt mid drive from GNG Electric. Have not decided on brushed of brushless yet.

Thanks for any information.

Kind Regards,
Red
Redstone02 is offline  
Old 07-27-12, 05:24 PM
  #135  
SpockNard
Junior Member
 
Join Date: Jul 2012
Location: Fountain Hills, AZ
Posts: 8

Bikes: Schwinn Traveler 1964, High Sierra 1984, EV Global eBike, Schwinn 1977 LeTour

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
I have purchased several LiFePO4 battery/charger combos via a few vendors on eBay. Have also bought conversion kits with motor/wheel/battery/charger. I also worked with one mfr. to get 10 batteries custom made to fit old EVGlobal battery cases. The last time I looked, any US sellers were selling Chinese made anyhoo- can't say what situation is now. I have had no problems at all so far in 2 years' experience. But be advised, if there is a problem, shipping costs are such that some Chinese sellers are real reluctant about exchanges, and returns would cost you. No warranties, but lots of feedback to see. Yes, the duct tape looks crappy- I put 'em in nylon bags and strap to bike rack for conversions.

Originally Posted by arni0202
I've heard LiFePo4 Batteries are good??? There are a few sellers on Ebay and they range from 150 to $300. Should these be trusted? Do they have warranties? They're coming from people in China mostly and they're covered in Duct Tape it looks like lol Go to ebay and type in Lifepo4 and you'll see what I mean. Are there any "respected" websites that sell similar lifepo4 batteries with warranties and the like?
SpockNard is offline  
Old 07-30-12, 03:56 AM
  #136  
Kevin Harvey
Senior Member
 
Join Date: Jun 2012
Posts: 64
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
The specs. on these battery cells & the BMS data is all on there web site or as much as i can give anyone , The main thing is getting the big BMS , The oldest one i sold a guy has been going near every day for the last 2 months with it , the 12 ah compared to another small cell headway bat which i stuffed the bms on(was sure harder doing the BMS signal wires on it) does go further in miles distance but if any thing seems less power able to take the big hills as sometimes cutting out for a rest as they do if a good BMS.Chargers are 3A excellent all so far. I'd not touch another Brushed motor. I used before going cyclone the EZip 450w but put it on the left of bike eventualy got a throdle & controller but by that time she was near stuffed it would get so hot y]d fry an egg on it where the 500w 24v cyclone never get very hot.the 960 36v does though.
Kevin Harvey is offline  
Old 07-30-12, 10:40 AM
  #137  
Apache Thunder
Interdimensional Spy
 
Apache Thunder's Avatar
 
Join Date: Dec 2011
Posts: 57
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
This was the LifePo4 Battery I have:

eBay - Item#230827885844

I've gone over 70 miles on it and it's been through several good charge cycles and thus far it's holding up. At this point I would be willing to recommend him if your on a tight budget. It's possible they are "duct tape" batteries" But the ones this guy had had that black textured covering over them just as they appear in the "stock" photo he provides. The charger is working as advertised and is indeed a 6 amp charger (or close to it). I get about 13 miles out of a single charge with my 350 watt 36 volt mid drive motor. It's not currently set up for the pedals to work, so that range is if you do no pedaling at all. If you have a higher power system, I would recommend getting a bigger capacity battery though. I think 12ah is the minimum that a 350watt system should run on so a 450+ would need 15ah or more.

The only thing to look out for when reading this guy's specs on the battery is that he got the "rated discharge" current wrong. Clearly it is not 12ah since if that was the case the battery would have cut out the moment I tried to use the motor. So apparently this guy gets the capacity and max discharge rate confused. He does state that the discharge rate for this battery is 2C but I have no idea that that number means in the real world.

I'd recommend asking for express shipping if you buy from him. Like most China sellers, they will ship by sea mail if you don't elect for express. Expect 8+ weeks for delivery if you don't get express shipping. With that seller, it was an extra $87 on top of the $66 shipping to get it to the US in under 6 days. Though would have been faster if there wasn't a few communication mishaps.

You can probably find one sold in the USA, but even if the seller gets them from China, they will still charge an arm and a leg for it compared to the prices you get by getting them direct from China. I'm on a shoestring budget, so I didn't have much choice.

Last edited by Apache Thunder; 07-30-12 at 10:49 AM.
Apache Thunder is offline  
Old 09-20-12, 10:39 AM
  #138  
Frankman
Newbie
 
Join Date: Sep 2012
Posts: 1
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Anyone had any experience with buying these:

https://www.ebay.com/itm/36V-20AH-LiF...item439fd325ce
Frankman is offline  
Old 10-11-12, 11:35 PM
  #139  
Faithfulfather
Newbie
 
Join Date: Oct 2012
Location: Louisiana
Posts: 2

Bikes: Specialized Expedition Schwinn w/48v 1000W motor kit

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Originally Posted by Frankman
Anyone had any experience with buying these:

https://www.ebay.com/itm/36V-20AH-LiF...item439fd325ce

I bought my 48v 15ah tonight from the same seller. I am also interested in feedback on this seller.
Faithfulfather is offline  
Old 10-15-12, 01:28 PM
  #140  
nimbuzz
Member
 
Join Date: Sep 2011
Location: Mendocino Co, CA, USA On Hwy #1
Posts: 29

Bikes: Optibike R11 and Prodeco Outlaw 48 V

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 6 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Hey Powell--Can you please tell us what brand of batteries these are and a link?

PS--Why would you not state this in the post?
nimbuzz is offline  
Old 10-22-12, 06:05 AM
  #141  
Faithfulfather
Newbie
 
Join Date: Oct 2012
Location: Louisiana
Posts: 2

Bikes: Specialized Expedition Schwinn w/48v 1000W motor kit

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Originally Posted by nimbuzz
Hey Powell--Can you please tell us what brand of batteries these are and a link?

PS--Why would you not state this in the post?

No need to be rude! He stated he used "Lifebatt" batteries.
Faithfulfather is offline  
Old 10-22-12, 11:27 AM
  #142  
ShinyBiker
Pedaling fool
 
ShinyBiker's Avatar
 
Join Date: Jul 2007
Location: Arlington, VA
Posts: 767

Bikes: 07 Schwinn Voyageur GSD, Next Avalon, 2007 Dahon Yeah

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 6 Post(s)
Likes: 0
Liked 2 Times in 2 Posts
Is there are chart that compares 24v, 36v, 48v to the lipo batteries? Lipos have something like 10s, 12s, which is all foreign to me. I am more familiar with the voltage ones and the ah ratings. Thanks.
ShinyBiker is offline  
Old 11-04-12, 12:23 PM
  #143  
DrkAngel
Full Member
 
DrkAngel's Avatar
 
Join Date: Oct 2012
Location: Upstate NY
Posts: 339

Bikes: Various "modded" eZips and multiple econversions

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 2 Post(s)
Likes: 0
Liked 2 Times in 2 Posts
Lightbulb SLA - Lithium Comparison

Originally Posted by ShinyBiker
Is there are chart that compares 24v, 36v, 48v to the lipo batteries? Lipos have something like 10s, 12s, which is all foreign to me. I am more familiar with the voltage ones and the ah ratings. Thanks.
"s" stands for "series", specifically cells in series.
The typical SLA 12V battery is actually comprised of 6 - 2V cells = 6s.

1 - 12V = 12V = 6s
2 - 12V = 24V = 12s
3 - 12V = 36V = 18s
4 - 12V = 48V = 24s

The difference is that Lithiums are typically produced as singular cells, then packaged into "packs".

LiFePO4 and variations are rated at 3.2V per cell.
4s = 12.6V.
8s = 25.2V
12s = 38.4V
16s = 50.4V

Lipo - Li-ion and certain other formulations are typically 3.7V per cell.

3s = 11.1V
6s = 22.2V
7s = 25.9V I use 7s on the 24V eZips (oem 24v controller works fine with the 7s = 25.9V - 29.4V fully charged)
10s = 37V
12V = 44.4V
13s = 48.1V
Most "Lithium batteries" are labeled similar to 7s 10p
"p" standing for "parallel".
A 3.7V 2600mAh cell run 7 in series would be a 25.9V 2.6Ah battery. - 7s1p
10 of these batteries run parallel would be a 25.9V 26Ah battery. - 7s 10p

Last edited by DrkAngel; 11-05-12 at 02:18 PM.
DrkAngel is offline  
Old 12-10-12, 07:17 PM
  #144  
ChrisRider
Junior Member
 
Join Date: Dec 2012
Location: Sydney
Posts: 9
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
I wouldnt buy LiFePo4 batteries from China, i wouldnt buy any Chinese brand of battery, ive had alot of experience with this, and they fail at a much greater rate, and they dont last the distance. Only buy an electric bicycle battery that uses Panasonic Battery Cells. For the extra price you will get much more distance out per charge, and will last you longer in years too.
ChrisRider is offline  
Old 12-31-12, 08:56 AM
  #145  
DrkAngel
Full Member
 
DrkAngel's Avatar
 
Join Date: Oct 2012
Location: Upstate NY
Posts: 339

Bikes: Various "modded" eZips and multiple econversions

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 2 Post(s)
Likes: 0
Liked 2 Times in 2 Posts
Originally Posted by ChrisRider
I wouldnt buy LiFePo4 batteries from China, i wouldnt buy any Chinese brand of battery, ive had alot of experience with this, and they fail at a much greater rate, and they dont last the distance. Only buy an electric bicycle battery that uses Panasonic Battery Cells. For the extra price you will get much more distance out per charge, and will last you longer in years too.
Panasonic has been increasing and transferring its Li-ion production to China.

Panasonic
starts China battery line | The Japan Times Online

[h=3]Panasonic Inaugurates New Lithium-ion Battery Plant in China to ...[/h][h=3]Panasonic to Make More Batteries in China - WSJ.com[/h][h=3]Panasonic Looks to China for Lithium-Ion Battery Manufacturing ...[/h]Report: Panasonic to increase li-ion battery production in China
DrkAngel is offline  
Old 01-09-13, 09:20 AM
  #146  
Kevin Harvey
Senior Member
 
Join Date: Jun 2012
Posts: 64
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
I make my own packs-- buy chinese cells (BMSbattery,or greenbatterybike ,or another) easy with big cells ,don't save much but get a better battery front mount under & ea side .The Web sites fool you into buying the low bms then have to buy another but one learns from mistakes yet agai wish i could upload a pic so you;d see the shape, made from 2 lengths 65mm pvc downpipe
Kevin Harvey is offline  
Old 01-15-13, 01:35 PM
  #147  
Kevin Harvey
Senior Member
 
Join Date: Jun 2012
Posts: 64
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
I do not know about warranty but so far these people are good but u must up the Amps on the pack to be bigger to meet yr motor
Kevin Harvey is offline  
Old 01-26-13, 11:21 AM
  #148  
Kevin Harvey
Senior Member
 
Join Date: Jun 2012
Posts: 64
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
This is my type pack , Fibre glass goes ea side of front stem on any bike.

Attached Images
File Type: jpg
me 220.jpg (55.1 KB, 397 views)
Kevin Harvey is offline  
Old 02-11-13, 02:04 PM
  #149  
Kevin Harvey
Senior Member
 
Join Date: Jun 2012
Posts: 64
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Make yr own but be carefull all connections need be so as will not loosen (locktight them ,u stuff the BMS's otherwise)) get the biggest BMS . In total still cost about what a pack costs but you can get the weight down low and up front.My 500w cylone I at 70 still toss it over a fence ---23kg its weight.
Kevin Harvey is offline  
Old 07-09-13, 09:05 AM
  #150  
love my trike
Newbie
 
Join Date: Jul 2013
Location: Southern Illinois
Posts: 1

Bikes: two motorized trikes

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Hi, I know nothing about electric so please be basic in answering my questions. I have a 48v motor that I am trying to get started. I have put 4 lawn and garden 12v batteries to, but when anyone puts a meter on then I get to much voltage. There are no repair shops for electric bikes and have not found anyone to help me here. Can someone help me?? Or at least tell me where to go for help.
love my trike is offline  

Thread Tools
Search this Thread

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service -

Copyright © 2024 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.