Help with surplus prismatic cell specs

[Sparky_SC]

Update !

Recovered a bunch of cells, assembled 2 12v packs in 4s config and charged. First pack load test aborted early (approx half way) because one cell was dropping faster than the others, not a bad cell but poorly matched to the others. Pack #2 balanced very well and load tested at 169.08 AH, so safe to say they are 170ah cells. Pack # 2 cells only varied between 6 and 12mv until the very end of the test when the spread became worse with 10ah or so left to go. The inverter tripped out on low voltage (10.5) and the bms low voltage never triggered. Pack was at very close to 11V at end of test and dropping quick.

I have another 4S BMS on the way so I can test/charge 2 packs at a time to speed things up, I have 180 cells on hand and more coming so test time is important. I have two power supplies for testing, one 12V 25A that is variable 10-15V, and a bigger one that is 0-20V at 45A. Working with two setups at once will speed up things a lot.

Now, after the first successful test I have a good handle on what to expect and the characteristics of the cells. Discharge/capacity tests were done at around 50A because the BMS is only rated for 60A.

 

[740GLE]

What’s the final goal of these cells? Will you be using all 180 cells?

Looking to unload any of them to willing parties?

 

[Sparky_SC]

What’s the final goal of these cells? Will you be using all 180 cells?

Looking to unload any of them to willing parties?

There are actually 300 of these cells ! I got 180 in hand and another 120 coming in a week or so !! Testing them efficiently will be a priority due to the number. Most if not all are already spoken for, not all sorted out yet. Personally I am preliminary planning on making 4 batteries in 16S config for my use (64 cells total plus keep a few spares on hand just in case)

 

[DJSmiley]

170Ah, 16S = little over 8kWh / pack
with 4 packs 32kWh

That's nice! And considering you have a whole lot more left and an incredible price (duh)... you're a lucky bastard

Definitely worth the effort to charge/test them

 

[kuranaga]

4.2V is for Li-Ion batteries, not LFP! beware, sometimes they sell LiIon as LFP on Alibaba. There are cells that look very close to the 280Ah blue ones but have completely different chemistry

 

[kuranaga]

for instance:

This product is no longer available.

This product is no longer available.

www.alibaba.com

 

[Sparky_SC]

4.2V is for Li-Ion batteries, not LFP! beware, sometimes they sell LiIon as LFP on Alibaba. There are cells that look very close to the 280Ah blue ones but have completely different chemistry

Yes but not a concern in this case. These are US made and I have the manufacturers spec sheet.

 

[Sparky_SC]

US made LFP?

International Battery Inc. Allentown PA Out of business now though