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Lithium Iron Phosphate
#1
So I went on my monthly trip to my recycler to pick up my quota of 200 laptop and medical packs and he had set these aside for me.
Gota remember to bring a DMM everytime i go from now on. They are K2B24V10EB Looks like there are ~50 of them.
What I can deduce they have an incredibly life cycle (+1000 cycles). BMS included internally? If I get them
does 50s2p for a nominal V of 51.2 sound OK?  9.6Ah X 25 = 240Ah and that's usable not like my lead acids.
Comments, suggestions?
Wolf

  
friedpenguin, bogptrsn, Church1182 like this post
If 18 X 650 = 2200+mAh then we have power! 
May all your Cells have an IR of 75mΩ or less Smile
Last count as of 5/19/2019
Total Number of Cells                          5263
Cells  >80% of Capacity                      3703
Cells <80% of Capacity                       1535
Cells ≥2200mAh & ≥ 80% & ≤75mΩ    2563
For Info Google Drive
Not your average Wolf       
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#2
Wow! That could be a deal depending on what life is left and what they want for them. Spec sheet indicates to me an internal BMS as it says you cannot put them in series (last line under Max Operating Conditions) and it has high and low voltage cutoffs built in. So if you need a 24V solution that pile could be what, 12ish kWh of capacity? 

If you can get a couple test, and your supplier gives/sells them to you at a reasonable rate I'd collect them all, test, and resell them if you personally don't need them. Looks like it could be a killer deal for someone building a 24 V system. (Cough cough)  Angel
James 1:19-20

Not all those who wander are lost - J. R. R. Tolkien
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#3
How many $$???!!! Those are great batteries. I have 7 and would love more. You can flip those for serious $$ and be a good guy and offer them up here!
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#4
(04-02-2019, 06:53 PM)friedpenguin Wrote: How many $$???!!! Those are great batteries. I have 7 and would love more. You can flip those for serious $$ and be a good guy and offer them up here!
 Church1182 and friedpenguin


I will be going to pick up more laptop cells in a couple of weeks and can check them for V and IR.
The Recycler has agreed to keep them for me to sell. I cannot use them as I am running a 48V system
so my bad fortune is your good luck. I will try to acquire them as reasonable as I can and pass the savings on to whomever is interested.
Anything I should know and check on them from your experience with them?

Shipping should not be a problem I suspect as they are contained in their own case more or less like a laptop battery.

Wolf
If 18 X 650 = 2200+mAh then we have power! 
May all your Cells have an IR of 75mΩ or less Smile
Last count as of 5/19/2019
Total Number of Cells                          5263
Cells  >80% of Capacity                      3703
Cells <80% of Capacity                       1535
Cells ≥2200mAh & ≥ 80% & ≤75mΩ    2563
For Info Google Drive
Not your average Wolf       
            Cool



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#5
Most of mine I bought as "not working" but they were just too low to take a normal charge. So really, go crazy! I will watch this like a hawk tomorrow and reply ASAP if you get numbers. Where in the US are you?
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#6
(04-03-2019, 06:12 AM)friedpenguin Wrote: Most of mine I bought as "not working" but they were just too low to take a normal charge. So really, go crazy! I will watch this like a hawk tomorrow and reply ASAP if you get numbers. Where in the US are you?

I am in the Portland Maine area so on the other coast.

As I said it will be a couple of weeks before I know what condition they are in. I will then let everyone know.

Wolf
If 18 X 650 = 2200+mAh then we have power! 
May all your Cells have an IR of 75mΩ or less Smile
Last count as of 5/19/2019
Total Number of Cells                          5263
Cells  >80% of Capacity                      3703
Cells <80% of Capacity                       1535
Cells ≥2200mAh & ≥ 80% & ≤75mΩ    2563
For Info Google Drive
Not your average Wolf       
            Cool



Reply
#7
Yeah, not the Portland close to me that's for sure. Though I've been through your Portland when I worked outside of Bar Harbor. If you throw together a 7s 18650 you can equalize the K2 batteries a bit. If you get them to 20v they should charge fine. 18v or lower I don't think they'll work with their intended charger. That's all I did to revive all of mine.
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#8
(04-03-2019, 04:22 PM)friedpenguin Wrote: Yeah, not the Portland close to me that's for sure. Though I've been through your Portland when I worked outside of Bar Harbor. If you throw together a 7s 18650 you can equalize the K2 batteries a bit. If you get them to 20v they should charge fine. 18v or lower I don't think they'll work with their intended charger. That's all I did to revive all of mine.

Ok I went on my trip and checked a bunch of them and they were all at 25V to 26V there are 72 of them.
I took 5 to test and see what transpires. I got 1 on a CC/CV charging at 29.2V at 2A. Am I understanding correctly that they have their own internal BMS and balancing system so I can't really hurt them?
They supposedly came from a hospitals emergency lighting system and where replaced because of time. I cant imagine they have very many cycles on them as they would only be used when the power goes out and how often does that happen in the New England area?
Besides the generators would kick in after a couple of minutes anyway.

If they pan out let me know who is interested
If 18 X 650 = 2200+mAh then we have power! 
May all your Cells have an IR of 75mΩ or less Smile
Last count as of 5/19/2019
Total Number of Cells                          5263
Cells  >80% of Capacity                      3703
Cells <80% of Capacity                       1535
Cells ≥2200mAh & ≥ 80% & ≤75mΩ    2563
For Info Google Drive
Not your average Wolf       
            Cool



Reply
#9
Wolf, I'm pretty sure you can parallel LA & LiFePo4's in a nominal 48V system your LAs voltages are not 48V they'd be early 50V ish?
You could begin migration to LiFePo4's as well?
Running off solar, DIY & electronics fan :-)
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#10
(04-27-2019, 08:52 AM)Redpacket Wrote: Wolf, I'm pretty sure you can parallel LA & LiFePo4's in a nominal 48V system your LAs voltages are not 48V they'd be early 50V ish?
You could begin migration to LiFePo4's as well?

Yea I thought of that also but according to the spec sheet you can't put them in series. Last line on the max operating conditions.




Wolf
If 18 X 650 = 2200+mAh then we have power! 
May all your Cells have an IR of 75mΩ or less Smile
Last count as of 5/19/2019
Total Number of Cells                          5263
Cells  >80% of Capacity                      3703
Cells <80% of Capacity                       1535
Cells ≥2200mAh & ≥ 80% & ≤75mΩ    2563
For Info Google Drive
Not your average Wolf       
            Cool



Reply


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