33140 3.2V 15Ah LiFePO4 Battery Cell for Energy Storage

Reliable Power for Your Energy Storage Needs

Unlock Long-lasting Performance with the LiFePO4 Battery

Experience uninterrupted power with the LiFePO4 battery. Designed for energy storage applications, this high-capacity cylindrical lithium iron phosphate (LiFePO4) battery cell delivers exceptional performance and reliability. With a voltage of 3.2V and an impressive capacity of 15Ah, it provides a steady and consistent power supply for your energy storage systems.

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Power Your Devices Efficiently with Lithium Iron Phosphate (LiFePO4) Technology

The LiFePO4 battery features advanced lithium iron phosphate technology, offering numerous advantages over traditional lithium-ion batteries. Benefit from its superior thermal stability, enhanced safety, and longer lifespan. This technology ensures your energy storage systems operate optimally, providing peace of mind and reliable performance.

Optimize Energy Efficiency with Rechargeable LiFePO4 Battery Cell

The LiFePO4 battery is rechargeable, allowing you to maximize energy efficiency. With a rechargeable design, you can easily replenish the battery’s power, reducing waste and minimizing your environmental impact. Embrace sustainable energy solutions with this eco-friendly and cost-effective battery cell.

Shanghai Electric Gotion New Energy Technology Co., Ltd., a joint venture between Shanghai Electric Group Co., ltd. and Guoxuan High-tech Co., Ltd. which is established in December . Shanghai Electric Group Co., Ltd. amount to 51% of the total registered capital which is 300 million yuan, while Hefei Gotion High-tech Power Energy Co., Ltd. amount to the rest 49%.

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We will fully utilize the brand effect, accumulated technology, resources advantage and manufacturing experience of both parties in the field of energy equipment and power battery to bring into play the synergy effect of the industrial chain.

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On December 26, , the Shanghai Electric Gotion energy storage system (Nantong) base project held a groundbreaking ceremony in the Nantong Economic and Technological Development Zone. The project owns an annual output of 10GWh lithium-ion battery energy storage system production base, which is jointly constructed by Shanghai Electric and Gotion Hi-Tech in two phases. It covers an area of 294,668 square meters and the total construction area is about 280,000 square meters. The first phase of the project has built a 5GWh energy storage battery system product line, which has been put into operation in the second quarter of . It is the most advanced and largest lithium-ion battery energy storage system industrial base in the east of China .

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Received 36 cells and 5 cells were either bad or marginal: 3 were completely bad with .021V 1.8V and 2.1V, the marginals had 2.77 and 2.8V - since all the others were 3.0-3.11v (almost all 3.05-3.08V with a few outliers) the marginals had obviously self-discharged and are not something I want to use. A 14% failure rate. The copper tabs were oxidized so these werent new cells right off the assembly line.

I did a capacity test on two cells of 3.65V down to 2.5V at 7A (approx .5C) and one came at at 13.4AH and the other 13.5AH. The battery got warmer than ambient but not by much, I could barely detect a difference by feel.

The copper tabs are the best feature, I found I could solder them with my Weller D550 260W soldering gun with no problem - sand the tabs to bright copper, add a little dab of flux and a drop of solder held on the gun for 30 seconds and then touched to the tabs and it adhered and spread out immediately. I was then able to tin and solder a 12 gauge wire onto the cell. My 100W soldering gun was NOT enough to solder these with.

At $8 bucks they're still a hell of a buy, but just know you're not really buying 15AH cells and they've got a 14% failure rate right out of the box.

Presented below beside a Headway 8AH as a comparison. Positive and Negative aren't marked so I put a black line around one end for the negative.


Sorry, not measured and I didnt take down the data to calculate it.

Something I didnt mention in the above: when it took it off the charger it was exactly 3.6v and in two hours when I did the discharge test it'd only dropped to 3.55v which reassured me a lot as to the quality of the cells as charge voltage holding is one of the best ways as a first-pass judge of the quality of a cell. Finally got the second batch of 41 cells (36 for order and 5 replacements) and every single one was good and tested at 3.185V -+ .01V with one exception that tested at 3.145V. Exceptionally well packed. Did a capacity test and they tested out again at exactly 15AH even at a 2C rate.

Gotta say I'm really liking the copper ends, dead easy to solder as long as you have a soldering gun big enough.

Very happy with the cells, never ordering slowboat again for small orders like this though. 2 months pretty much to the day to arrive.

I think they're a good buy if small cells is what you want.

So far LiitoKala has proven to be a good vendor, wouldn't hesitate to order from them again. Not sure what was up with the duds on my original order but they replaced them at no cost so no-harm-no-foul. Hello Maast,

I am new on this forum, and I am trying to find some information that Liitokala or GuoXuan are not giving for the LFP cell.
Reading your rewiew, I see that I could use them but, still, some informations are missing for my application.
Could you please tell me if you did it, or could try the following tests?

- 1C Charge,time needed for it,and see if the cell does not warm up too much, 2.5C continuous discharge to 2.5V, average voltage during discharge, final Temp if the cell is not to stressed.
- 1.5C Charge, same discharge test at 2.5C.

it is difficult to buy only one and if I receive a bad cell, it will be a lot of wasted time to get a new one.

I know that you are not here to make everyone's tests, but as you like to share your results, I think these cells are really promising at 187Wh/kg for eV's and RC models...

Best regards,

Vincent

Hello Maast,

I am new on this forum, and I am trying to find some information that Liitokala or GuoXuan are not giving for the LFP cell.
Reading your rewiew, I see that I could use them but, still, some informations are missing for my application.
Could you please tell me if you did it, or could try the following tests?

- 1C Charge,time needed for it,and see if the cell does not warm up too much, 2.5C continuous discharge to 2.5V, average voltage during discharge, final Temp if the cell is not to stressed.
- 1.5C Charge, same discharge test at 2.5C.

it is difficult to buy only one and if I receive a bad cell, it will be a lot of wasted time to get a new one.

I know that you are not here to make everyone's tests, but as you like to share your results, I think these cells are really promising at 187Wh/kg for eV's and RC models...

Best regards,

Vincent

Well, 1C by definition is 1 hour, in this case a 15AH cell would require 15A for 1 hour.

As noted above I did a 2C discharge and the cell reached 116F (46.6C) with a ambient temp of 65F. Which is pretty good and they're rated for a 2C discharge. I imagine a 2C charge would result in a near-identical temperature rise.

Hello,

thanks for the comments, yes I know that 1c/15A takes one hour, but sometime the charger (Icharger X8 for me) can"decide" to lower the charge current for any reason. I already tested a / Vapcell and it took 1 hour at 1C.
Do you have a PDF showing the 2C discharge capability? They say 75A for 5s , I was expecting 35A continuous because the cell IR at 2-3 mOhms is quite low, if they end at less than 60°c after discharge, I could use them...

Vincent

Here's a PDF on the cells, it actually says 5C discharge max but I dont know if I believe that. You're also not supposed to solder it with anything but a laser welder but I did it anyway. Just use a 300 watt + iron and get the drop of solder very hot before touching it so it adheres and spreads before it heats up the innards of the battery.

Edit: just noticed it says 5A as a charge, that can't be right either. For a 15AH cell it should be around 7-10A.

Attachments

• LiitoKala 3.pdf LiitoKala 3.pdf

You're also not supposed to solder it with anything but a laser welder but I did it anyway. Just use a 300 watt + iron and get the drop of solder very hot before touching it so it adheres and spreads before it heats up the innards of the battery.

I hear ya. I soldered wires to regular AA Eneloops to make a battery pack for my scanner and you're not supposed to do that either. It does help to sand or file the surface so the solder will adhere quicker like you said. Back in the day I used acid core solder and that would stick to almost anything but it was nasty stuff. And further back in the day when I was a kid my first soldering kit was a Weller gun like yours. But I think it was a 60/100 or close.

Edit: just noticed it says 5A as a charge, that can't be right either. For a 15AH cell it should be around 7-10A.

If they would be willing to provide the spec sheet from the manufacturer that would be helpful. There might be markings under the PVC wrap that would help identify them. I am curious how close the capacity matches up between the batteries.

I did notice one reviewer mentioned one of his cells leaked so that's something to be aware of. Hello,

yes, I spent hours to find usefull datas on there 15Ah cell, and the ones from Liitokala are not accurate at all, this link shows more realistic numbers

https://www.alibaba.com/product-det...spm=a.galleryofferlist.0.0.29ec2d16NmiMr5

If the can be charged at over 1C, and discharged at 3C , it can replace Li-Poly for not to power hungry flying machine, the big drawback is the format and size, but in a Rc Boat, it will be fine.

Reading some short reports: I will have to check if they can be stored for months with no too much self discharge, electrolyte leaks, close capacity and IR. I will order 60, to make 8+7s/1P 15Ah packs, test each cell before making them. as usual , I will not have a BMS, but a balancer cable.
I hope I can get them within 2 months. I will give the test results from dicharge test.

Thanks for your help!

Hello,

yes, I spent hours to find usefull datas on there 15Ah cell, and the ones from Liitokala are not accurate at all, this link shows more realistic numbers

https://www.alibaba.com/product-det...spm=a.galleryofferlist.0.0.29ec2d16NmiMr5

If the can be charged at over 1C, and discharged at 3C , it can replace Li-Poly for not to power hungry flying machine, the big drawback is the format and size, but in a Rc Boat, it will be fine.

Reading some short reports: I will have to check if they can be stored for months with no too much self discharge, electrolyte leaks, close capacity and IR. I will order 60, to make 8+7s/1P 15Ah packs, test each cell before making them. as usual , I will not have a BMS, but a balancer cable.
I hope I can get them within 2 months. I will give the test results from dicharge test.

Thanks for your help!

Good find, I'd go with those. I could tell the ones I got had been sitting on the shelf for a really long time as the copper was quite dark - the same copper color as the pipes in my 21 year old house. But they were cheap so....

Received 36 cells and 5 cells were either bad or marginal: 3 were completely bad with .021V 1.8V and 2.1V, the marginals had 2.77 and 2.8V - since all the others were 3.0-3.11v (almost all 3.05-3.08V with a few outliers) the marginals had obviously self-discharged and are not something I want to use. A 14% failure rate. The copper tabs were oxidized so these werent new cells right off the assembly line.

I did a capacity test on two cells of 3.65V down to 2.5V at 7A (approx .5C) and one came at at 13.4AH and the other 13.5AH. The battery got warmer than ambient but not by much, I could barely detect a difference by feel.

The copper tabs are the best feature, I found I could solder them with my Weller D550 260W soldering gun with no problem - sand the tabs to bright copper, add a little dab of flux and a drop of solder held on the gun for 30 seconds and then touched to the tabs and it adhered and spread out immediately. I was then able to tin and solder a 12 gauge wire onto the cell. My 100W soldering gun was NOT enough to solder these with.

At $8 bucks they're still a hell of a buy, but just know you're not really buying 15AH cells and they've got a 14% failure rate right out of the box.

Presented below beside a Headway 8AH as a comparison. Positive and Negative aren't marked so I put a black line around one end for the negative.
View attachment

View attachment

What's the max charge current on these batteries so I no what charger to get. I am look around 4 hours max charge time.

Thanks I received 60 cells made in April , I am testing them at 35A constant current discharge, 3.5V end of charge, 2.8v cutoff, and the best is giving 15.2Ah, the worst 14.4, typical is 15Ah. to make this test I just solder 4mm² short wires with 4mm gold connectors on each side, and then connect them to the output of the charger. My soldering iron is a 80W weller, soldering take less than 5 seconds, I do not use a 450°c solder, more 350°c (old one). I am a laser service engineer but I do not have this kind of source for my hobby...

Anybody tried a high-current spot welder?

I do not have this kind of source for my hobby...

What would be a good choice for a spot welder

So many ways to buy or build a spot welder and I have been watching so many YouTube videos, I am lost. I see cheap one may or may not work or blowup. Some that keep tripping the breakers or trips the breakers. For now, I just want to rebuild some Ryobi battery packs. Also found some battery...