need li-mn 36v cell

[randomlight]

I just recieved a new battery from Ping and am very happy. I thought now I would try to repair my old limn battery and need to replace a cell. The battery consisted of 10 cells and I found the name of the original manufacterer in china printed on them. I tried to contact them twice to see if I could get just one cell and also asked for the name of one of their distributors but they will not reply.I was hoping if I posted the information I have and a picture of the cell someone may be able to tell me where I might get one.
The name of the manufacture is King-Co
http://king-co.hnipp.com/Product/Cell/2010-10-27/JingKeChanBenDianCheGuiGeBiao.htm

The specs for my battery said it was a limn 36v 10ah but on the King-Co the coresponding part number on the cell (K325665N)lists it as both a 8 ah or a 9 ah.I don`t know if that makes a difference.
Any way I`m going to uplad some pictures and if anyone could tell me where I can get a cell like this I would be very grateful .

 

[randomlight]

After 38 views I have not heard from anyone who knows where I could find this cell. I guess I will have to take a different approach.
Could anyone tell me wow I could find (or build) any 36v 10ah cell that would work with the other 9 cells in the battery pack. I would sure hate to throw it all away because of one bad cell....Again thanks for any advice

 

[floatingdog]

I've never seen a cell like yours. The experts here will probably need a little more information about the individual cells to help. I'm definitely not one of the experts, so take what I say with a grain of salt and be VERY CAREFUL. If you've read much about high powered batteries you know that if they are mishandled the house or garage can end up in flames. Please don't be offended if I'm preaching to the choir.

What is the voltage of one of the good cells? Is the cell something like 4.2V fully charged or is it really 36V or higher? In your original post you said you were looking for a 36v 10ah cell. If that is the right spec for the cell, that means you have a 36v 100AH pack. That doesn't sound likely unless the pack is huge. This all relates to how the cells are configured in your pack, serial or parallel. If you are not clear on this sort of thing, i would recommend additional research before trying to fix the pack.

You may be able to get some drill pack li-mn cells and parallel or serial them up to the necessary AH/voltage. Search for Fatpack or konion and you will find lots relevant posts and some possible sources for li-mn cells.

Alternately, you can probably use your pack minus the bad cell as a backup and just live with the lower voltage or capacity. I suspect the cells are 3.6V. If so with 9 cells the pack will have a lower voltage and the bike you run it on will lose roughly 10% of its previous top speed capability. The LVC on your controller may cut out prematurely if you can't adjust it. If the cells really are 36V, you will just lose 10% of your capacity.

good luck!

 

[randomlight]

thanks floatingdog in answer to your question when fully charged it records 42-43 volts.You mentioned something interesting, I would be happy to use this battery as a back-up battery with just 9 cells.I just didn`t know that I could do that.I wonder if my bms will be happy with that?

 

[floatingdog]

I know little about BMSs. As I understand it, their main job is to monitor voltage at the cell level and not let individual cells drop below a minimum voltage by cutting off the whole pack when one cell hits LVC (low voltage cutoff). Some BMSs also have HVC (high voltage cutoff) if I understand. Your BMS may work fine with 9 cells. If you don't know quite a bit more than i do, you probably shouldn't mess with it until you do a lot more research. You'll find plenty of relevant threads here if you search around a little. Even though LiMn is one of the safer lithium chemistries, I'd store and work on your pack in a fireproof area. Also, be careful not to get Kentucky Fried Fingers. If you haven't come across a post on that subject, search for 'kentucy fried'. You'll find some impressive pictures of what can happen when battery packs get shorted.

Steveo is a member here that, at least in the past, has done repairs/ebike work for hire.

Good luck!

 

[dnmun]

ask ping if he will find a replacement limn cell for you. if it is the same capacity, and same chemistry the internal resistance should be similar. then you can use the current charger too. if ping can find it, which i am sure he can, maybe you could order two, in case another fails, or 3. since shipping is most of the cost and he may give you a better price for 3. then if you don't need it you could sell it to the next guy with the same problem.

 

[neptronix]

If you don't fix this pack up, amberwolf and/or drkangel would prolly offer you some $ for it.

I personally would junk or re purpose the cells for another use, and then proceed to build or buy a pack made out of cells that are easy to find replacements for ( RC Lipo, headways, ping, konions, A123, etc etc. )

 

[randomlight]

Thanks for all the suggestions and help folks. Ping has ofered to build me a bms and sell me a charger that will handle the 9 cells that are good. this is the best solution for me given that I can`t find a cell to replace the bad one and the dealer wants 700.00 plus to replace one of these.I have a ping lifepo but I like the original because it is designed to fit in my bike. thanks again