What’s the best lifepo4 AVAILABLE?

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Hummina Shadeeba

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The big Tesla cylindrical cells are seeming the best energy to weight, no?

When or where are they available in smaller quantities at a reasonable price?

They’re double the energy to weight of the green a123 26650

The 4680 size is nice. I don’t see the Panasonic version available yet of any others that have a decent power output.
 
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For cylindrical cells, what you can easily get are 40135 20Ah cells from the likes of EVE (EVE C40) at about 180-185Wh/kg:
www.nkon.nl

EVE C40 40135 - 20Ah - 60A LiFePO4 - 3.2V - A-grade

Nominal Capacity - 20000mAh Nominal Voltage - 3.2V End-of-charge Voltage - 3.65V End-of-charge Current - 1000mA End-of-discharge Voltage - 2.5V Weight - 374gram Standard Charging Current - 10000mA Standard Discharge Current - 10000mA Max Continuous Discharge Current - 60000mA 4000 Cycles...
www.nkon.nl www.nkon.nl

There also exists a nice 165Wh/kg 18650 cell, but I'd advise against building with 18650 cells today for practical reasons:
www.nkon.nl

JGNE 18650 2200mAh - 6.6A LifePO4 - 3.2V

Capacity: 2200mAh Minimum Capacity: 2100 Rated Voltage: 3.2 V AC internal Resistance: ≤25 mΩ max. Discharge Current: 6.6 A Pulse Discharge current: 10A Plus Pool: Flat Top Chemistry: LifePO4 Protection circuit: without Diameter: 18.6 mm Height: 65.2 mm Weight: 43g
www.nkon.nl www.nkon.nl

Similar for 26650 and 26700 respectively:
www.nkon.nl

Tenpower IFR26700-45HE 4500mAh - 9A LiFePO4 - 3.2V

Capacity: 4,500 mAh Cell Voltage: V Discharge Current: 9 A Internal resistance: ≤20 mΩ Charging: 0 ° C to 55°C Discharge: -20°C To 60°C Diameter: 26.6 mm (Max) Height: 71.2 mm (max) Weight: 98g (Max)
www.nkon.nl www.nkon.nl
www.nkon.nl

JGNE 26650 4500mAh - 13.5A LifePO4 - 3.2V

Capacity: 4500mAh Minimum Capacity: 4400 Rated Voltage: 3.2 V AC internal Resistance: ≤20 mΩ max. Discharge Current: 13.5 A Pulse Discharge current: 20A Plus Pool: Flat Top Chemistry: LifePO4 Protection circuit: without Diameter: 26.45 mm Height: 65.70 mm Weight: 89g
www.nkon.nl www.nkon.nl

There do exist even higher energy density prismatic cells that you can buy today, but you then start from a much larger pack :p
 
Hummina Shadeeba said:
They’re double the energy to weight of the green a123 26650
Click to expand...
Yes, but depending on the size and the use/performance you need, the a123 cells are “power” dense, with a much higher discharge rate (20C continuous, and 50C pulse !) …which i believe is still class leading for LiFePo4….that is their big advantage.
For best energy density (high capacity packs) , the prismatic cells are the winners.
 
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@byke
Messaged me with what seem ideal cells for their power output (70amp peak), energy density (57 to 35 milliwatts per gram compared to a123 26650), and size at 15amp hour and no cells in parallel necessary for me.


I think 75 amps peak. Enough.

A great price! New

www.evlithium.com

Gotion 3.2V 15Ah 32135 cylindrical lifepo4 battery cell

Gotion 3.2V 15Ah 32135 cylindrical lifepo4 battery cell
www.evlithium.com
 
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You must be reading a different spec sheet to me ?
..the one in the link quotes a capacity of “1,500mAh” and rhe ability to support a 1C continuous discharge witha max pulse discharge of 3C, or 4,500 mA
Something screwed up there !..be very sure what you are ordering
..The other feature of the a123 26650, is their long history of quality product and proven industry use.
It is a pity a123 stopped producing their large format cylindrical cells (32180 ?)
 
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Hillhater said:
You must be reading a different spec sheet to me ?
..the one in the link quotes a capacity of “1,500mAh” and rhe ability to support a 1C continuous discharge witha max pulse discharge of 3C, or 4,500 mA
Something screwed up there !..be very sure what you are ordering
..The other feature of the a123 26650, is their long history of quality product and proven industry use.
It is a pity a123 stopped producing their large format cylindrical cells (32180 ?)
Click to expand...
Those are typo's. Should read 15,000 mAh and 45,000 mA
 
Hillhater said:
I hope you are correct, but anyway, sloppy data reporting.
And that 45,000 mA is a a “pulse” discharge rate (3C), with a continuous rating of only 1c, 15.0Ah
… someway from that 75 A ?
Click to expand...
The sloppy data reporting is by Evlithium hopefully, and not by the manufacturer.

Gotion 32135 15Ah 3.2V LFP Lithium-ion cell IFR32135-15Ah

>50K in stock, 2025 Fresh cells Grade A IFR32135-15Ah, fast shipping by air or sea. We hold full Cell Specification, MSDS, UN38.3, BIS, CB IEC62133, UL test reports.
www.ancoo-battery.com
 
Hillhater said:
I hope you are correct, but anyway, sloppy data reporting.
And that 45,000 mA is a a “pulse” discharge rate (3C), with a continuous rating of only 1c, 15.0Ah
… someway from that 75 A ?
Click to expand...
Yea I only saw 75a peak on one site. 3c seems the peak and not enough. Even when I thought was 75a I was a bit disappointed and I had the no-longer-available k2 26650 with 3800mah.
Claimed peak of 28. 3 in parallel would sag and was weak and went back to a123s
 
Any other lifepo4 that have maybe double the power and half the length?

I haven’t seen data sheets of any of the 4680 size. As it is they’re supposedly a cheap tech but unobtainable except very expensive
 
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There are also A123 Lifepo Pouch cells. I have bought a few 20Ah pouches.
I did test the JK B2A24S20P BMS with them, 500A for 10 seconds and 450A peaks for 20 seconds, 400A for 30 seconds.
They performed very good, now the battery has an easy life in the Kids Kettcar drawing a maximum of 25A.
 
dominik h said:
There are also A123 Lifepo Pouch cells. I have bought a few 20Ah pouches.
I did test the JK B2A24S20P BMS with them, 500A for 10 seconds and 450A peaks for 20 seconds, 400A for 30 seconds.
They performed very good, now the battery has an easy life in the Kids Kettcar drawing a maximum of 25A.
Click to expand...
are the ones still being made in china good? I understand a123 was sold and owned in china now.
I’d get the 12ah version. I didn’t do the math but are they lighter than the a123 cylindrical per watthour?
 
A123 also have 8Ah 50C pouch cells
Sorry, never thought about weight
 
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