Grade ? Lifepo4 Batteries for sale tested at 180ah

[Lococheii]

Finally capacity tested these so called 320ah batteries. The test completed at 180ah. So not as advertised, the cost is still too high at $527.00 since they are grade "B" cells. If anyone wants to buy them $100.00 takes all four. The rating is not what the label states, codes are covered, for the price could make a good camper battery. I will not ship them, they are located near Albuquerque NM.

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[Made in North Pole]

I can buy it only if you are willing to ship them to NJ.

 

[Lococheii]

Sorry the batteries are not worth the shipping cost, thank you for your reply.

 

[matt2006]

Interested; are you willing to ship to CA

 

[Lococheii]

The batteries have been sold. Thank you for your interest.

 

[NwCali]

hey, I'll buy them if you ship them..

Lol...Joking..its not like people even read your post...Sorry you got batteries that would not meet the stated capacity.

wonder if folks are still waiting on their cario batteries?

 

[OzSolar]

Lol...Joking..its not like people even read your post

Still available? What's the cost with shipping to 12345?

 

[RCinFLA]

Capacity, especially measured at relatively low discharge current, is not the final word on battery quality.

Used cells have greater internal impedance. This results in greater cell voltage slump under moderate load current. It can render cells unusable at anything more than low discharge current rates.

A good LFP cell should make its rated capacity at 0.5 C(A) discharge current rate. For a 280 AH cell that is 140-amp discharge rate for two hours. To get a reliable result for AH testing it should be done with at least 0.2 to 0.4 C(A) discharge rate. A 280 AH cell tested with a 20-amp max load tester is only getting discharged at 0.07 C(A) rate. If you are going to do a full capacity test at low discharge current, you should also do a moderate current 3 minute load test near mid state of charge.

A good quick test is a three-minute load test at 0.2 to 0.4 C(A) load current rate near about 50% state of charge. Compare rested no-load terminal voltage to loaded terminal voltage after 3 minutes into load draw. It is also a good way to assure matched cells. Matched cells will have similar voltage slump delta after 3 minutes of moderate loading. The amount of terminal voltage slump under moderate load can rise 3 to 5 times over life of cell. This can be over 0.5 volt terminal voltage slump per cell at moderate load current for a used cell compared to less than 0.1 volt slump for a new cell.

The 3 minute moderate load test correlates well to the more time consuming full capacity discharge test. The quick load test will not correlate if cell damage is delamination of electrode material (graphite or LFP) from their respective copper/aluminum foil current collector. A 1 KHz battery impedance meter test will show electrode delamination with a greater resistance reading on meter.

Battery 1 KHz impedance test is dominantly just static cell resistance due to conductive materials of cell. It does not include much contribution due to lithium ion migration resistance which is critical to supporting moderate cell current.