NewStats: 3,264,159 , 8,182,820 topics. Date: Monday, 09 June 2025 at 11:07 PM 3v4zp

abuzz33:


Most lifepo4 batteries in the Nigerian market are not grade A and those that are are very expensive. Powmr has a history of fudging numbers and poor quality. I take their 6,000 cycles with a grain of salt.

As for lifepo4 it's a superior and more flexible technology for lots of applications. But basic stuff lead acid is perfectly ok.

I use both and this was the second set of luminous batteries I bought. The inverlast battery I used for 5 years and it was still as strong as ever. Luminous is a great rugged brand and testament to this is the fact that schneider bought them out.

you are lying i no believe you

.

Iinnov8:


You have indicted Felicity as being average. You have also condemned Powmr. Have you really used LiFePO4 lithium batteries before? Which one do you recommend as being Grade A?

Powmr has proven itself to be a reliable brand - from its old and best-selling HHJ charge controller to its new M60 controller and its recent array of hybrid inverters. Most of the reviews on their products are positive

Also, I have had one of our contributors here do a capacity test on the Powmr LifePo4 cells (which are actually Rept cells as pointed out by someone up there) and it performed more than its rated capacity. The video has been posted here.

The insides of the Powmr battery has also been opened to show the cells and the QR code scanned. The video has also been posted here

We have also concluded a 1C (1200w+) discharge test on the battery while showing the individual cells maintaining the same voltage as they approached the lower knees of the discharge curve (close to 100% DoD), and the video will be posted shortly. According to experts here, that is the litmus test to know Grade A cells. See video excerpt attached

Do you have such test results and videos for your tubular battery?

If you want to know the difference between grade A and grade B cells, cycle them over several years and then check for capacity. Don't go on what is stated by a manufacturer. Lead acid is known technology. Lifepo4 is new technology with lots of unknowns.

One of the here discovered 20% capacity loss of his supposedly grade A eve cells after just two years of usage or less than 800 cycles:

https://diysolarforum.com/threads/20-capacity-loss-and-bulging-after-2-5-years-of-use.88604/

Again I take the 6,000 cycle promise with a grain of salt and look at the warranties given which are often 5-10 years or max 4,000 cycles.

abuzz33:


If you want to know the difference between grade A and grade B cells, cycle them over several years and then check for capacity. Don't go on what is stated by a manufacturer. Lead acid is known technology. Lifepo4 is new technology with lots of unknowns.

One of the here discovered 20% capacity loss of his supposedly grade A eve cells after just two years of usage or less than 800 cycles:

https://diysolarforum.com/threads/20-capacity-loss-and-bulging-after-2-5-years-of-use.88604/

Again I take the 6,000 cycle promise with a grain of salt and look at the warranties given which are often 5-10 years or max 4,000 cycles.

I'm always happy when I see people going extra mile to proof their points. It's very wrong to argue and make claims without proof. Thanks for this information.
Going back to the OP, my observation is still what I've been saying. It's very WRONG to entirely depends on what sellers are telling you including myself.
Do a thorough research/investigation before you put in your hard earned cash into it.
1. He said that batched and matched grade A Lf280K cells were sold to him in March 2022.
Did he forward the manufacturer test reports to EV for verification?. The answer is No.
2. Did he physically examine the cells?. He didn't say it.
3. After the top balancing and equalisation, did he observe the self discharge of the cells?. He didn't tell us.
Though the temperature of his region is closer to ours and he occasionally charged and discharged at 0.27C with the temperature of 38°C (not even up to 0.5C), that's not enough reason for 20% degradation under 2 years of use.
Though the charging and discharging with respect to temperature are some of the reasons for cells degradation/bulging but I'm very certain that in the case of the OP, he may have gotten low quality grade B cells without knowing.
Just as you've rightly said, seeing a cell with 8000 cycle life, carrying out capacity test to see above the rated capacity does not really mean that the cell would give up to 4 years.
Capacity can give you fake sense of quality. Self discharge is a BIGGER ISSUE. This is that when cells are resting.

abuzz33:


If you want to know the difference between grade A and grade B cells, cycle them over several years and then check for capacity. Don't go on what is stated by a manufacturer. Lead acid is known technology. Lifepo4 is new technology with lots of unknowns.

One of the here discovered 20% capacity loss of his supposedly grade A eve cells after just two years of usage or less than 800 cycles:

https://diysolarforum.com/threads/20-capacity-loss-and-bulging-after-2-5-years-of-use.88604/

Again I take the 6,000 cycle promise with a grain of salt and look at the warranties given which are often 5-10 years or max 4,000 cycles.

. Thanks for the insight and reference to someone else experience tho….. but still doesn’t change the question if you ever use the Lifep04 battery technology before? What is your own personal experience with them? Let us hear and learn from you tell us about the grade A cells that you know or can recommend

Also let me inform you that the glorified lead acid/tubular has more fake brands currently in the market…like 220ah not even performing upto standard 50% DOD despite been new and all that.

My point is fake brand is always a common thing in the new technology world we are right now and it’s almost inevitable

FEGEITOK:
I've gotten a response

Can you please share too... I need it as well, I've chatted them no response for more than a week now. Thanks

abuzz33:


If you want to know the difference between grade A and grade B cells, cycle them over several years and then check for capacity. Don't go on what is stated by a manufacturer. Lead acid is known technology. Lifepo4 is new technology with lots of unknowns.

One of the here discovered 20% capacity loss of his supposedly grade A eve cells after just two years of usage or less than 800 cycles:

https://diysolarforum.com/threads/20-capacity-loss-and-bulging-after-2-5-years-of-use.88604/

Again I take the 6,000 cycle promise with a grain of salt and look at the warranties given which are often 5-10 years or max 4,000 cycles.

This is an interesting read if any one is into lithium Phosphate or considering Lithium batteries.
What i learnt after carefully reading through the post...
1) Lithium cells don't like extremes of temperature. We must Put them in a cooled environment, they perform within 15c to 40c of temperature but best around 25c
2) They don't like extreme rapid charging either. The charging must be within the recommended C rate. Most times it's usually 0.2C
3) Recommended Bulk voltage is around 56.8v but most people on the forum advised 55.2v which I believe is preferable for longevity
Lithium Phosphate is a promising battery chemistry but it's not infallible and I hope our sellers are willing to uphold warranty when issues like this comes up

This made me start thinking of Lithium titanate, does anyone here has any experience with Lithium titanate?. Does it address any of the above issues as regards temperature and C rate charging and discharging

Peterlove11:


This is an interesting read if any one is into lithium Phosphate or considering Lithium batteries.
What i learnt after carefully reading through the post...
1) Lithium cells don't like extremes of temperature. We must Put them in a cooled environment, they perform within 15c to 40c of temperature but best around 25c
2) They don't like extreme rapid charging either. The charging must be within the recommended C rate. Most times it's usually 0.2C
3) Recommended Bulk voltage is around 56.8v but most people on the forum advised 55.2v which I believe is preferable for longevity
Lithium Phosphate is a promising battery chemistry but it's not infallible and I hope our sellers are willing to uphold warranty when issues like this comes up

This made me start thinking of Lithium titanate, does anyone here has any experience with Lithium titanate?. Does it address any of the above issues as regards temperature and C rate charging and discharging

Lithium titanate?
I doubt if you would see any new product without any form of challenge. Even the MB30 and MB31 Eve released has their various challenges.
Lithium ion phosphate has a working voltage range of 3.000v-3.400v.
54.4v bulk charging and 53.6v float charging has always been my charging range.

isangjohnson:

Lithium titanate?
I doubt if you would see any new product without any form of challenge. Even the MB30 and MB31 Eve released has their various challenges.
Lithium ion phosphate has a working voltage range of 3.000v-3.400v.
54.4v bulk charging and 53.6v float charging has always been my charging range.

IMO I think one just have to find a sweet spot of charging n floating lithium batteries.

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isangjohnson:

Lithium titanate?
I doubt if you would see any new product without any form of challenge. Even the MB30 and MB31 Eve released has their various challenges.
Lithium ion phosphate has a working voltage range of 3.000v-3.400v.
54.4v bulk charging and 53.6v float charging has always been my charging range.

Why the difference in bulk/float charge? Thought it sud be same thing

isangjohnson:

Lithium titanate?
I doubt if you would see any new product without any form of challenge. Even the MB30 and MB31 Eve released has their various challenges.
Lithium ion phosphate has a working voltage range of 3.000v-3.400v.
54.4v bulk charging and 53.6v float charging has always been my charging range.

I even prefer your charging range.....but does it get to 100% SOC with this ?
For now I will pick liPO over lead . Lead can easily go astray if you ain't meticulous in managing it. At least someone commented on that forum of how he has been using Lithium for the past 6years with no noticeable loss in capacity, which is impressive

isangjohnson:

I'm always happy when I see people going extra mile to proof their points. It's very wrong to argue and make claims without proof. Thanks for this information.
Going back to the OP, my observation is still what I've been saying. It's very WRONG to entirely depends on what sellers are telling you including myself.
Do a thorough research/investigation before you put in your hard earned cash into it.
1. He said that batched and matched grade A Lf280K cells were sold to him in March 2022.
Did he forward the manufacturer test reports to EV for verification?. The answer is No.
2. Did he physically examine the cells?. He didn't say it.
3. After the top balancing and equalisation, did he observe the self discharge of the cells?. He didn't tell us.
Though the temperature of his region is closer to ours and he occasionally charged and discharged at 0.27C with the temperature of 38°C (not even up to 0.5C), that's not enough reason for 20% degradation under 2 years of use.
Though the charging and discharging with respect to temperature are some of the reasons for cells degradation/bulging but I'm very certain that in the case of the OP, he may have gotten low quality grade B cells without knowing.
Just as you've rightly said, seeing a cell with 8000 cycle life, carrying out capacity test to see above the rated capacity does not really mean that the cell would give up to 4 years.
Capacity can give you fake sense of quality. Self discharge is a BIGGER ISSUE. This is that when cells are resting.

Bigbrovar is on this forum and can answer for himself. But from my research:

1) There is evidence that the lifecycle of lifepo4 is greatly shortened the higher the average state of charge due to graphite reactivity with the electrolyte.

2) lifepo4 degrades irrespective of usage over time.

3) Lfp may say to charge up to 0.5C but truly it works best charging at 0.2C - 0.30C.

4) Each cell should not be overcharged and it's recommended 3.4v for bulk and 3.37v for float.

temizeee:
. Thanks for the insight and reference to someone else experience tho….. but still doesn’t change the question if you ever use the Lifep04 battery technology before? What is your own personal experience with them? Let us hear and learn from you tell us about the grade A cells that you know or can recommend

Also let me inform you that the glorified lead acid/tubular has more fake brands currently in the market…like 220ah not even performing upto standard 50% DOD despite been new and all that.

My point is fake brand is always a common thing in the new technology world we are right now and it’s almost inevitable

Yes there's lots of fake brands in the market. I bought felicity lfp a few years ago and found out half of what the alaba boys are selling have fake capacities.

Tubular the same thing. What used to be rugged is now being downgraded and sold under lots of brand names. I bought the 220a inverlast from simba six years ago. Very rugged. What's in the market now doesn't feel anything like that version.

Peterlove11:

I even prefer your charging range.....but does it get to 100% SOC with this ?
For now I will pick liPO over lead . Lead can easily go astray if you ain't meticulous in managing it. At least someone commented on that forum of how he has been using Lithium for the past 6years with no noticeable loss in capacity, which is impressive

That is the comment no one care about, but they used the One that was swollen, the ones that catches fire as yardstick!
Many don't have the correct tools, correct knowledge and experience yet they went into DIY.

Dam5reey1:


That is the comment no one care about, but they used the One that was swollen, the ones that catches fire as yardstick!
Many don't have the correct tools, correct knowledge and experience yet they went into DIY.

All i will say is that, the worst lithium ion ( not even LifePO4) scrapped from laptop batteries via diy route is 1m% better that any tubular battery under any brand. It is like comparing US with my village. Do you care to ask why:
1. Generator key starting fail after sometime?
2. No phone make use of lead acid batteries?
3. Ups batteries die untimely death
4. Rechargeable fan batteries pack up after a year or less?

N.B: Few generators now imploy lithium

Peterlove11:

I even prefer your charging range.....but does it get to 100% SOC with this ?
For now I will pick liPO over lead . Lead can easily go astray if you ain't meticulous in managing it. At least someone commented on that forum of how he has been using Lithium for the past 6years with no noticeable loss in capacity, which is impressive

It does.
That's the range I'm using and most people here used it too.

dollarnaira:
All i will say is that, the worst lithium ion ( not even LifePO4) scrapped from laptop batteries via diy route is 1m% better that any tubular battery under any brand. It is like comparing US with my village. Do you care to ask why:
1. Generator key starting fail after sometime?
2. No phone make use of lead acid batteries?
3. Ups batteries die untimely death
4. Rechargeable fan batteries pack up after a year or less?

N.B: Few generators now imploy lithium

Lifepo4 is a superior battery chemistry to lead acid any day any time.

But I regretted taking the part of recycled laptop battery, the money I wasted on it is enough to do something reasonable.

Please advice people taking that part to do proper capacity test and ensure they have good bms.

I once bought 50ah lifepo4 battery, the day I mistakenly switch it on while electric cooker is connected marks the end of the battery, the bms got damaged with a whole parallel.


Anybody going for lithium should go for quality instead of 4th life cells

zenith4biz:


Lifepo4 is a superior battery chemistry to lead acid any day any time.

But I regretted taking the part of recycled laptop battery, the money I wasted on it is enough to do something reasonable.

Please advice people taking that part to do proper capacity test and ensure they have good bms.

I once bought 50ah lifepo4 battery, the day I mistakenly switch it on while electric cooker is connected marks the end of the battery, the bms got damaged with a whole parallel.


Anybody going for lithium should go for quality instead of 4th life cells

Did you build the set up yourself? Did your inverter survive? Only a novice will extract batteries from laptop only to assume that all cells will be good.

good day all,

Please which one is the best between filicity lithium battery and cwoth lithium battery

whatsapp 08020574628 or telegram@ValtechEnergy

The specs sheet for LFP states the 6000cycles can only be achieved at 25 degrees. The cycle life reduces when operated or stored above this temperature.

I left a pack of lithium battery with 150 cycles in my car for 4 days earlier this year. I had no one to assist me carry it upstairs so I left it there.
The day I took it upstairs and put it on, I saw over 300 cycles. I thought my eyes were cloudy but it was real. I ignored it and another time I took a separate pack for testing in a client's house and still left it in the car for 2 days. The cycle life counted also jumped by over 50.

Then I went back to the datasheet and read it again before I saw that temperature statement.


The battery in question is not DIY but customised for a company just packed like pylontech. One of the best I have seen.


LFP just like lead acid batteries need to be stored or used within the stated temperature to achieve their cycle life but how many of us can afford banks that can run air conditioner for the batteries to maintain the temperature.

futurenix:
The specs sheet for LFP states the 6000cycles can only be achieved at 25 degrees. The cycle life reduces when operated or stored above this temperature.

I left a pack of lithium battery with 150 cycles in my car for 4 days earlier this year. I had no one to assist me carry it upstairs so I left it there.
The day I took it upstairs and put it on, I saw over 300 cycles. I thought my eyes were cloudy but it was real. I ignored it and another time I took a separate pack for testing in a client's house and still left it in the car for 2 days. The cycle life counted also jumped by over 50.

Then I went back to the datasheet and read it again before I saw that temperature statement.


The battery in question is not DIY but customised for a company just packed like pylontech. One of the best I have seen.


LFP just like lead acid batteries need to be stored or used within the stated temperature to achieve their cycle life but how many of us can afford banks that can run air conditioner for the batteries to maintain the temperature.

The Cycle count here is based on what scientifically?

futurenix:
The specs sheet for LFP states the 6000cycles can only be achieved at 25 degrees. The cycle life reduces when operated or stored above this temperature.

I left a pack of lithium battery with 150 cycles in my car for 4 days earlier this year. I had no one to assist me carry it upstairs so I left it there.
The day I took it upstairs and put it on, I saw over 300 cycles. I thought my eyes were cloudy but it was real. I ignored it and another time I took a separate pack for testing in a client's house and still left it in the car for 2 days. The cycle life counted also jumped by over 50.

Then I went back to the datasheet and read it again before I saw that temperature statement.


The battery in question is not DIY but customised for a company just packed like pylontech. One of the best I have seen.


LFP just like lead acid batteries need to be stored or used within the stated temperature to achieve their cycle life but how many of us can afford banks that can run air conditioner for the batteries to maintain the temperature.

Na heat inside car increase the cycle count

Please anyone that knows this guy should know that he is a scammer he withheld my 220ah tubular and some amount of money and refused to pick my call

Don't transact or do any business with him

His name is Mr Wilfred Ubadi Ifeanyi

09013128166. | 08028074483

@wilmaria14 on nairaland

A good evening to you all, please I need your professional advice in buying a transformerless inverter (24v 3.5kva or 5kva) as I want to go lithium. Something reasonably priced, please. You may even link me up with a reputable seller as well, please. I'm in Abuja.
Thank you all.

Why don't you go 48v and get the 5kva for future proof.

freeAgent99:
A good evening to you all, please I need your professional advice in buying a transformerless inverter (24v 3.5kva or 5kva) as I want to go lithium. Something reasonably priced, please. You may even link me up with a reputable seller as well, please. I'm in Abuja.
Thank you all.

[quote author=obitobe post=131754596]Why don't you go 48v and get the 5kva for future proof.

Looking at cost Sir, of both inverter and battery.

obitobe:
Why don't you go 48v and get the 5kva for future proof.

Looking at cost Sir, of both inverter and battery
But if you have something affordable, kindly point me in the direction.

Dam5reey1:


The Cycle count here is based on what scientifically?

That is what I can't explain but one of these added over 50 counts and the other over 100 counts. The CC there is cycle count if I am correct.

I have no other explanation than it being in that heated vehicle cause since then their counting has been normal

futurenix:


That is what I can't explain but one of these added over 50 counts and the other over 100 counts. The CC there is cycle count if I am correct.

I have no other explanation than it being in that heated vehicle cause since then their counting has been normal

I doubt storage temperature increases cycle count. Your display may have malfunctioned due to high temperature. The cycle count may likely be "audio" as in audio money