Docan EVE304 aH
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Alkaline
Solar Wizard
Docan only sells grade B, that being said people have good success with their CATL 280 that are testing to near 300AH. Actually its beating most grade A 280s in capacity test (for now at least).
Grade A = manufacturer test report, there is a big thread you can read up on: https://diysolarforum.com/threads/are-we-all-getting-grade-b-cells.39156/
Here are grade A sellers in USA:
currentconnected grade A calb 230
18650batterystore grade A EVE 105, EVE 280K
sunfunkits grade A EVE 304
Most people are buying the 280s because cost / WH is good, however, if buying 280K even if grade A you will probably have a hard time getting 280AH, it is only something that affects this cell and not the 280N or the 304.
But yeah, unless they have a manufacturer test report (that lists each cell individually) they are grade B, works for most people but you can run into issues with bad cells so considering buying a spare one just in case.
Grade A = manufacturer test report, there is a big thread you can read up on: https://diysolarforum.com/threads/are-we-all-getting-grade-b-cells.39156/
Here are grade A sellers in USA:
currentconnected grade A calb 230
18650batterystore grade A EVE 105, EVE 280K
sunfunkits grade A EVE 304
Most people are buying the 280s because cost / WH is good, however, if buying 280K even if grade A you will probably have a hard time getting 280AH, it is only something that affects this cell and not the 280N or the 304.
But yeah, unless they have a manufacturer test report (that lists each cell individually) they are grade B, works for most people but you can run into issues with bad cells so considering buying a spare one just in case.
teckersley
New Member
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Can you expand on the statement that Docan only sells grade B. I don't think that's accurate. At least I don't think so. I Just picked up a couple of their EVE 105ah cells. All specs and indications appear to be Grade A but I would like to hear more.
Thanks
Alkaline
Solar Wizard
If you are not going to spend the time to research then just go buy whatever you feel like, that thread I linked to explains everything in depth. This is the problem with DIY 90% of the people don't want to do any research...
teckersley
New Member
- Joined
- Dec 30, 2022
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Helpful comment based on "research" form reading another thread on the internet. Nice.
houseofancients
Solar Wizard
sunfunkits is certainly NOT selling any grade a cells....
They'll be fine. Build your battery and live happily ever after. 
Supposedly 'grade a' are the ones that test out the highest with a lab report and are sold to the EV industry. Ones that are almost as good are sold out through the resellers. They're still good batteries, and still have valid QR codes etched on them.
Install with a good bms, a lot of Overkill users, and a compatible charging system, and you'll be satisfied. Don't try to push them to the extreme, build in some extra capacity and redundancy.
Docan has better batteries for cheaper than sunfun. Contact either Amy and place your order from Houston.
Supposedly 'grade a' are the ones that test out the highest with a lab report and are sold to the EV industry. Ones that are almost as good are sold out through the resellers. They're still good batteries, and still have valid QR codes etched on them.
Install with a good bms, a lot of Overkill users, and a compatible charging system, and you'll be satisfied. Don't try to push them to the extreme, build in some extra capacity and redundancy.
Docan has better batteries for cheaper than sunfun. Contact either Amy and place your order from Houston.
Alkaline
Solar Wizard
Example of grade A:
www.18650batterystore.com
www.fogstar.co.uk
www.currentconnected.com
Example of grade B:
www.alibaba.com
www.18650batterystore.com
www.fogstar.co.uk
www.currentconnected.com
Grade A = comes with test report form the manufacturer
Grade B = does not come with test report, has fake QR codes or or other STUFF THAT DOCAN has BEEN DOING. Despite this the CATL 280s they are selling are quite nice for the price...
Vendors selling grade A will give you a copy of the manufacturer test report / cell, vendors that do not will either state they are grade B or make up bs. Generally vendors in the USA/UK state this clearly, but literally all the alibabab/aliexpress sellers (with the exception of Luyuan) will not tell you the truth.
People on this forum are highly opinionated so don't take any one's word and do your own research, finally you can contact EVE directly on there Alibaba channel and ask them: https://evebatteryglobal.en.alibaba.com/?spm=a2700.7735675.0.0.32425d7cSjSnsA they can verify what is or is not true.
Finally understand the difference between Grade A vs Grade B does not mean grade B is bad. However, the chances of you getting bad cells with grade B is much higher than grade A, that being said most people do just fine with grade B but do require them to manually sort/match and provide some extra care for them.
I own grade B from XUba and Basen and Grade A from Luyuan. I am happiest with my Luyuan purchase the most overall.
EVE LF280K V3 Grade A Cells - 3.2V LiFePO4 280Ah Battery
Brand new Grade A EVE LF280K LiFePO4 cells with 280Ah capacity. 10+ years design life, 6,000 cycles. Get unmatched power and performance for your energy storage needs.
www.18650batterystore.com
EVE LiFePO4 280Ah Prismatic Cell (Grade A)
Experience the pinnacle of energy storage technology with the V3 LF280K Eve Prismatic Cells, a cutting-edge line of Grade A Lithium Iron Phosphate batteries, also known as LiFePO4 Prismatic Cells. Full certification, supporting documents are available upon request (UN38.3, Specification Reports...
www.fogstar.co.uk
SunFunKits.com - Certified Grade A Genuine EVE Lithium MB31 Lithium Iron Phosphate Battery 314AH 4 pack - Sun fun kits
SunFunKits.com - Certified Grade A Genuine EVE Lithium MB31 Lithium Iron Phosphate Battery 314AH 4 pack - Sun fun kits
www.sunfunkits.com
CALB 3.2V 230Ah LiFePO4 Battery Cells - Grade A++ | Current Connected
Discover CALB 3.2V 230Ah LiFePO4 Battery Cells: advanced lithium technology, superior specifications, and optimal power delivery for your applications.
www.currentconnected.com
Example of grade B:
Luyuan 4pcs 280ah Lifepo4 (lfp) 3.2v Cells Battery (bulk,Voltage & Ir Matched )---new Version With 8000cycles - Buy Lithium Iron Battery Packs lifepo4 Battery Cell electric Car Battery Product on Alibaba.com
Luyuan 4pcs 280ah Lifepo4 (lfp) 3.2v Cells Battery (bulk,Voltage & Ir Matched )---new Version With 8000cycles - Buy Lithium Iron Battery Packs lifepo4 Battery Cell electric Car Battery Product on Alibaba.com
REPT 280Ah Grade B Cells - 3.2V LiFePO4 Battery
Price is per battery Grade B Cells - Original QR Code is scratched out BRAND NEW CELLS - Capacity tested - sorted and matched. Guaranteed to pull 280Ah+ 1 Busbars and 2 nuts included per battery. 30 day warranty, moneyback guarantee. Grade A and Grade B refer to the quality or performance...
www.18650batterystore.com
EVE LiFePO4 280Ah Prismatic Cell (Grade B)
Eve LiFePO4 280Ah Grade B Prismatic Cells are ideal for off-grid solar batteries, campervan batteries, and leisure batteries. Grade B cells, full certification, supporting documents are available upon request (UN38.3, Specification Reports & MSDS).
www.fogstar.co.uk
EVE LF280 | 280Ah 3.2v LiFePO4 Cells | Grade B ~ Current Connected
Cells show no signs of swelling. Factory QR Codes are In-tact, however have the letter "B" over top of them. Guaranteed to pull 280ah Capacity. Stocked in USA - Ships within 24 hours and arrives in 2-5 days. Price is PER CELL, minimum quantity 4 cells, and only sold in groups of 4
www.currentconnected.com
Grade A = comes with test report form the manufacturer
Grade B = does not come with test report, has fake QR codes or or other STUFF THAT DOCAN has BEEN DOING. Despite this the CATL 280s they are selling are quite nice for the price...
Vendors selling grade A will give you a copy of the manufacturer test report / cell, vendors that do not will either state they are grade B or make up bs. Generally vendors in the USA/UK state this clearly, but literally all the alibabab/aliexpress sellers (with the exception of Luyuan) will not tell you the truth.
People on this forum are highly opinionated so don't take any one's word and do your own research, finally you can contact EVE directly on there Alibaba channel and ask them: https://evebatteryglobal.en.alibaba.com/?spm=a2700.7735675.0.0.32425d7cSjSnsA they can verify what is or is not true.
Finally understand the difference between Grade A vs Grade B does not mean grade B is bad. However, the chances of you getting bad cells with grade B is much higher than grade A, that being said most people do just fine with grade B but do require them to manually sort/match and provide some extra care for them.
I own grade B from XUba and Basen and Grade A from Luyuan. I am happiest with my Luyuan purchase the most overall.
houseofancients
Solar Wizard
as to sunfunkits and their grade a claims, this should be a very interesting topic to read up on :
diysolarforum.com
Sunfunkits show their true color
They really suck. They do not even know how to use test equipment properly. I sure like to see SunfunShits response in the video.
diysolarforum.com
Yeah I remember that, I wouldn't give SFK a wooden nickel.as to sunfunkits and their grade a claims, this should be a very interesting topic to read up on :
Sunfunkits show their true color
They really suck. They do not even know how to use test equipment properly. I sure like to see SunfunShits response in the video.
42OhmsPA
Who likes Electrical Gremlins?
Wow! How did you come across that company? First I've seen them.
How about a bunch of photos?
TinyTechSolar
New Member
Just ended testing EVE304 from Docan.
After reading a lot of positive feedback about Docan power on this forum, decided to order a test batch from them.
They conviniently even had 304Ah at EU stock in Poland.
Daisy Efest agent was very pleasant and informative with fast reponses.
I clearly exaplined my concern that I expect a minimum of 304Ah from each cell and she literally guaranteed that, with just a weird exception that cells should be tested with EBC 40L tester.
paid $627.21 USD
The goods came very fast as promissed. Very well packaged. First time I saw that foam was thorougly glued around the cells.
Cell voltage were pretty close with just one slightly off and IR 0,3-0,6 (Though I consider these measurements pretty pointless)
I always do a quick test on 4 cell packs with calibrated iCharger X8.
1)top balance the pack at 3,6 volts
2)discharge with regenerative method at 30amps down to 2,5v the first cell reaches (other battery takes the power in)
So at 2,5v it cut off at 302.84AH for the weakest cell
And others hold better.
~310 ~311 ~306
As a result the pack is crippled by one weak cell.
Shared the results with the agent and received classic numerous excuses that cells are from the same batch and they measure voltage and resistance before sending. And if I order a big batch directly from China they can test it for me thorougly.
At least she wasn't feeding me nonsense as our previous seller who was stating that supplied 280Ah that measured just 230ah will grow capacity with more cycle charges
Will just keep the pack of course
Definitely not buying from them again, considering I get the same gamble as from other sellers but at higher cost.
there were no even hints of trying to resolve it and even assume there is a probability of manufacturing defects. They acted as they knew it could happen and were just spewing out prepared excuses.
After reading a lot of positive feedback about Docan power on this forum, decided to order a test batch from them.
They conviniently even had 304Ah at EU stock in Poland.
Daisy Efest agent was very pleasant and informative with fast reponses.
I clearly exaplined my concern that I expect a minimum of 304Ah from each cell and she literally guaranteed that, with just a weird exception that cells should be tested with EBC 40L tester.
paid $627.21 USD
The goods came very fast as promissed. Very well packaged. First time I saw that foam was thorougly glued around the cells.
Cell voltage were pretty close with just one slightly off and IR 0,3-0,6 (Though I consider these measurements pretty pointless)
I always do a quick test on 4 cell packs with calibrated iCharger X8.
1)top balance the pack at 3,6 volts
2)discharge with regenerative method at 30amps down to 2,5v the first cell reaches (other battery takes the power in)
So at 2,5v it cut off at 302.84AH for the weakest cell
And others hold better.
~310 ~311 ~306
As a result the pack is crippled by one weak cell.
Shared the results with the agent and received classic numerous excuses that cells are from the same batch and they measure voltage and resistance before sending. And if I order a big batch directly from China they can test it for me thorougly.
At least she wasn't feeding me nonsense as our previous seller who was stating that supplied 280Ah that measured just 230ah will grow capacity with more cycle charges
Will just keep the pack of course
Definitely not buying from them again, considering I get the same gamble as from other sellers but at higher cost.
there were no even hints of trying to resolve it and even assume there is a probability of manufacturing defects. They acted as they knew it could happen and were just spewing out prepared excuses.
Alkaline
Solar Wizard
What were your WH readings?
TomC4306
Solar Obsessive
TomC4306
Solar Obsessive
A real battery tester... Not a hobby charger.
TomC4306
Solar Obsessive
I was unaware that these could be purchased with a NIST certificate...
houseofancients
Solar Wizard
as @TomC4306 already stated, how can anyone take this seriously ?Just ended testing EVE304 from Docan.
After reading a lot of positive feedback about Docan power on this forum, decided to order a test batch from them.
They conviniently even had 304Ah at EU stock in Poland.
Daisy Efest agent was very pleasant and informative with fast reponses.
I clearly exaplined my concern that I expect a minimum of 304Ah from each cell and she literally guaranteed that, with just a weird exception that cells should be tested with EBC 40L tester.
paid $627.21 USD
The goods came very fast as promissed. Very well packaged. First time I saw that foam was thorougly glued around the cells.
Cell voltage were pretty close with just one slightly off and IR 0,3-0,6 (Though I consider these measurements pretty pointless)
I always do a quick test on 4 cell packs with calibrated iCharger X8.
1)top balance the pack at 3,6 volts
2)discharge with regenerative method at 30amps down to 2,5v the first cell reaches (other battery takes the power in)
So at 2,5v it cut off at 302.84AH for the weakest cell
And others hold better.
~310 ~311 ~306
As a result the pack is crippled by one weak cell.
Shared the results with the agent and received classic numerous excuses that cells are from the same batch and they measure voltage and resistance before sending. And if I order a big batch directly from China they can test it for me thorougly.
At least she wasn't feeding me nonsense as our previous seller who was stating that supplied 280Ah that measured just 230ah will grow capacity with more cycle charges
Will just keep the pack of course
Definitely not buying from them again, considering I get the same gamble as from other sellers but at higher cost.
there were no even hints of trying to resolve it and even assume there is a probability of manufacturing defects. They acted as they knew it could happen and were just spewing out prepared excuses.
you took a hobby charger, you're missing 1,5 ah, and you are crippled ?
dear lord, you really do need to get yourself out more
42OhmsPA
Who likes Electrical Gremlins?
So one cell was less than 0.5% below claimed capacity when charged to 3.6v?Just ended testing EVE304 from Docan.
After reading a lot of positive feedback about Docan power on this forum, decided to order a test batch from them.
They conviniently even had 304Ah at EU stock in Poland.
Daisy Efest agent was very pleasant and informative with fast reponses.
I clearly exaplined my concern that I expect a minimum of 304Ah from each cell and she literally guaranteed that, with just a weird exception that cells should be tested with EBC 40L tester.
paid $627.21 USD
The goods came very fast as promissed. Very well packaged. First time I saw that foam was thorougly glued around the cells.
Cell voltage were pretty close with just one slightly off and IR 0,3-0,6 (Though I consider these measurements pretty pointless)
I always do a quick test on 4 cell packs with calibrated iCharger X8.
1)top balance the pack at 3,6 volts
2)discharge with regenerative method at 30amps down to 2,5v the first cell reaches (other battery takes the power in)
So at 2,5v it cut off at 302.84AH for the weakest cell
And others hold better.
~310 ~311 ~306
As a result the pack is crippled by one weak cell.
Shared the results with the agent and received classic numerous excuses that cells are from the same batch and they measure voltage and resistance before sending. And if I order a big batch directly from China they can test it for me thorougly.
At least she wasn't feeding me nonsense as our previous seller who was stating that supplied 280Ah that measured just 230ah will grow capacity with more cycle charges
Will just keep the pack of course
Definitely not buying from them again, considering I get the same gamble as from other sellers but at higher cost.
there were no even hints of trying to resolve it and even assume there is a probability of manufacturing defects. They acted as they knew it could happen and were just spewing out prepared excuses.
Wow I'd be thrilled.
TinyTechSolar
New Member
3897WH of course more juice is left in other 3 cells
TinyTechSolar
New Member
not at 156usd per cell.
Alkaline
Solar Wizard
Then you met capacity, 3864 / 4 = 966 WH
the 304 is a 966 WH Cell
For grade B if you meet either the AH or WH you should accept. Grade A 304 is going for 1.5x-2x the price.
the 304 is a 966 WH Cell
For grade B if you meet either the AH or WH you should accept. Grade A 304 is going for 1.5x-2x the price.
TinyTechSolar
New Member
More than 3% mismatch between cells will wear that weak cell pretty fast
Alkaline
Solar Wizard
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