Beginners Guide to Processing 18650 Cells | Cell Database


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Hover Board Packs from Ebay
#31
(08-05-2017, 03:22 AM)bfleury Wrote:
(05-13-2017, 02:53 AM)Korishan Wrote: It's possible the could be using a thin bead of super glue. I'm sure almost all of us have had a run in with super glue. A very little bit can do a lot adhesion.

It appears to be something like super glue on them.

Hello,
I bought 2000 of the cells from them.  I've been pre-charging the packs, then breaking them down and then testing them on the Opus and 4S chargers. ( Tested at .5a ) I'm over half way done and have been really happy so far. All the batteries are marked LGEAMF11865 and the majority of them are between 2100 and 2250mah.  I have a couple hundred between 2000 and 2100mah.  With less then 10 below 2000mah.   No complaints on capacity. 


 
I was lucky that almost all of them were the easier side mount BMS.  I have figured a way to do the center boards pretty fast and safe.

 
You strip the packs of shrink and protectors.

Cut off all exposed wires.

Next on the top 4 cells, cut the negative tabs off the board and then the positive tabs and remove batteries.

Grab the assembly and snap the board in half.


Cut all negative tabs on both sides of batteries on each side of boards.


Cut all positive tabs next making sure cutter is hitting insulating ring around top of the battery.

 
You can now pull the batteries apart to get the clearance to safely cut apart the pack.
 
No arcs or sparks.

I just gave up and dropped the pictures here.  It kept telling me my word count was too high with the pictures included.  The computer wins.  LOL




Hi,

I hope you can help me out with an issue.   I have to slow down for awhile because of a back injury and going into congestive heart failure with some kidney failure thrown in just for the fun of it.  So I'm a little spacey with the drugs the last few weeks....  besides being blond. Rolleyes    They are working on figuring what's going on.

In the mean time, I have all my cells at the full charge that the Opus and the 4s puts them at after a capacity test.  I'm wondering if keeping them at that voltage for a couple of months will do them harm?  I have found from doing the voltage checks after letting them sit for a couple weeks already, are mostly around 4.1vdc.

Thank you for any help you can give me. 

Brianna


Regardless of anything else, I hope your health improves.  All the very best.

Eric
Reply


#32
(08-08-2017, 01:07 AM)Eric Koshinsky Wrote:
(08-05-2017, 03:22 AM)bfleury Wrote:
(05-13-2017, 02:53 AM)Korishan Wrote: It's possible the could be using a thin bead of super glue. I'm sure almost all of us have had a run in with super glue. A very little bit can do a lot adhesion.

It appears to be something like super glue on them.

Hello,
I bought 2000 of the cells from them.  I've been pre-charging the packs, then breaking them down and then testing them on the Opus and 4S chargers. ( Tested at .5a ) I'm over half way done and have been really happy so far. All the batteries are marked LGEAMF11865 and the majority of them are between 2100 and 2250mah.  I have a couple hundred between 2000 and 2100mah.  With less then 10 below 2000mah.   No complaints on capacity. 


 
I was lucky that almost all of them were the easier side mount BMS.  I have figured a way to do the center boards pretty fast and safe.

 
You strip the packs of shrink and protectors.

Cut off all exposed wires.

Next on the top 4 cells, cut the negative tabs off the board and then the positive tabs and remove batteries.

Grab the assembly and snap the board in half.


Cut all negative tabs on both sides of batteries on each side of boards.


Cut all positive tabs next making sure cutter is hitting insulating ring around top of the battery.

 
You can now pull the batteries apart to get the clearance to safely cut apart the pack.
 
No arcs or sparks.

I just gave up and dropped the pictures here.  It kept telling me my word count was too high with the pictures included.  The computer wins.  LOL




Hi,

I hope you can help me out with an issue.   I have to slow down for awhile because of a back injury and going into congestive heart failure with some kidney failure thrown in just for the fun of it.  So I'm a little spacey with the drugs the last few weeks....  besides being blond. Rolleyes    They are working on figuring what's going on.

In the mean time, I have all my cells at the full charge that the Opus and the 4s puts them at after a capacity test.  I'm wondering if keeping them at that voltage for a couple of months will do them harm?  I have found from doing the voltage checks after letting them sit for a couple weeks already, are mostly around 4.1vdc.

Thank you for any help you can give me. 

Brianna


Regardless of anything else, I hope your health improves.  All the very best.

Eric
Thank you much Eric.   Smile
Brianna 
10.2KW StorEdge Solar system. Building 13KW 14s60p x 2  48v powerwall with Batrium BMS System.
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#33
Anyone who bought these eBay packs and would like to sell me the BMS boards, please send me an email. Id like to get a few for testing and other experiments. If I am able to find a safe and useful application for them, I will post it for everyone. Cheers
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#34
I went with a limited hangout of ten packs, since I have historically been bad about accumulating more inventory than I have time to play with! (and battery technology, especially, is changing fast...) I do have an "immediate" application for them without taking the batteries apart, but paralleling them per Jehu's instruction: changing my 240VAC well pump of undetermined age over to a 36VDC model running off some solar panels and these batteries. I haven't done the math yet, but 10 packs should keep the water pressure up overnight.

All the batteries I have received (they arrived very quickly) test between 34 and 41 volts. I opened the shrink wrap off the one sandwiched BMS pak in the lot, and measured the cells: they all measured exactly the same voltage with my multimeter. No capacity testing yet.

Does anyone know how many more this vendor has available?
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#35
Hi all, is there any reason these can't be used "as-is"? 

I want to build a small backup/shop power system, and I've gotten a few of these packs toward that end. I'm coming to realize that 36v isn't a "normal" voltage for these types of systems, but I also note that several 36v inverters exist, both sine and modified sine. 

Why not keep the packs in the 10s2p configuration with the BMS, wire the packs in parallel (appropriate fusing 10A per pack?) to bus bars or suitable heavy gauge cable, and then wire that to a 36v inverter(also appropriately fused)? 

Charging then, should be a matter of wiring an appropriate charger into the bus bars (more fuses) and having the BMS handle charging the packs and maintaining balance via a common bus. (Or do each of the packs need to be charged individually)   

This all works in my head, is there something I'm not thinking of?
Reply
#36
(08-30-2017, 02:00 PM)farn Wrote: Hi all, is there any reason these can't be used "as-is"? 

I want to build a small backup/shop power system, and I've gotten a few of these packs toward that end. I'm coming to realize that 36v isn't a "normal" voltage for these types of systems, but I also note that several 36v inverters exist, both sine and modified sine. 

Why not keep the packs in the 10s2p configuration with the BMS, wire the packs in parallel (appropriate fusing 10A per pack?) to bus bars or suitable heavy gauge cable, and then wire that to a 36v inverter(also appropriately fused)? 

Charging then, should be a matter of wiring an appropriate charger into the bus bars (more fuses) and having the BMS handle charging the packs and maintaining balance via a common bus. (Or do each of the packs need to be charged individually)   

This all works in my head, is there something I'm not thinking of?

I think the BMS was the reason most of these caught fire. I wouldn't be reusing the BMS unless you do extensive testing to find and fix the problem.
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#37
Well that's certainly a compelling reason to disassemble these and rebuild new packs.
Thank you!
jdeadman and mike like this post
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#38
Sorry folks can someone post or pm me a link to the seller thank you
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#39
(09-07-2017, 10:04 AM)Mrsmith Wrote: Sorry folks can someone post or pm me a link to the seller thank you

10 Pack http://ebay.com/itm/201916138726
Seller Store https://www.ebay.com/sch/alarmhookup/m.html?item=201916138726
Mrsmith likes this post
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#40
(09-07-2017, 12:46 PM)mike Wrote:
(09-07-2017, 10:04 AM)Mrsmith Wrote: Sorry folks can someone post or pm me a link to the seller thank you

10 Pack http://ebay.com/itm/201916138726
Seller Store https://www.ebay.com/sch/alarmhookup/m.html?item=201916138726

Thanks Mike
Reply


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