EVE MB31 314Ah Cell Test and Review. Have I gotten selected cells to show on the channel?

[@markmdamp9438]

Well I just ordered 16@ MB31, I have watched Andy channel now for quite a while in the background not commenting but I have to say he comes across as a fair and unbiased person and does his best to review these products with unbiased opinions. Why I just spent $$$ on These lithium batteries as my AGM battery bank crashed and lost charge after 6 years of 24hrs/7 days use. Thanks Andy for your excellent channel you have helped alot of people.

[@580guru]

Thanks for expounding on your position regarding your relationship with the suppliers your channel works with and your refusal to pimp their products in exchange for $$ or spat. Keep up the great work!

[@DannyCsaszar]

Here is to 100k! Andy, I am feeling your excitement now that I just recieved 8 brand new prestine mb31 cells from Qishou. No dents no bloating and just made in March. What a dream come true! 🥰

[@tonyjarvis4970]

16 off MB31 cells delivered from Amy Peng at Shenzhen Qishou. All absolutely perfect and installed in a new version of the Seplos 280L case delivered direct from Eric at Seplos. All very seamless. Thank you for your recommendations Andy. Both took about 2 months from ordering to delivery in UK. The cells got held up for 10 days in customs/transport from dock. I would like to see a simple spreadsheet for Victron VEConfig and Seplos settings. I have produced my own simple sheet with information from an assortment of sources.

[@OrlandoSiciliano]

Thanks!

[@OffGridGarageAustralia]

Thank you very much for your support!

[@jimcisme1]

👍Thanks!

[@OffGridGarageAustralia]

Thank you very much, my friend!

[@johnnuske2878]

Wow! These cells are getting better all the time. love to upgrade Kings Adventure 12V 120Ah some time to a set of four MB31s. Have been watching your channel for a little while now. Very inspirational Andy. Thank you and very much the community that follow you for the valuable comments and experiences.

[@ocular57]

If your in Australia look up a mob called Lithiumway Batteries out of Rockhampton, they say they sell EVE 330Ahr batteries A Grade. OK price if the real thing.

[@KossuJahvetti]

Had to return 16 ea QSO 304Ah's but as said by Andy they handled it well. However the trust was gone and ordered from Duncan (or whatever it was spelled) and did received fairly good batch. So definitely they are testing what people tolerate and what not. I did specifically mention before ordering that each cell will be capacity tested with two electronic loads and will be returned if specs not met. So that's my story, happy now eventually. But I do encourage people however not accept crappy cells, it will harm everybody. 2cnts. Thanks for video!

[@typxxilps]

thanks for sharing cause I do not trust them at all. I have bought from a german dealer and at least got the capacity I was promised and cells produced on 1 day which you rarely find today.

[@davidpenfold]

​@@typxxilpsI've had two batches of 304Ah cells from QSO. The first arrived in summer and averaged 312Ah. The second arrived in winter and capacity was hugely influenced by temperature. They were ok, but tested badly because of the conditions. This is why I have a 20W temperature controlled heating mat for each battery bank now (on at 18°C, off at 20°C) with insulation to retain heat.

[@derfreiemensch]

@@davidpenfold Please bear in mind that if you use a steel box like Seplos or Gobel etc., condensation may form when using a heating pad, which you don't want to have in the box. That's why I don't understand people who want to use the batteries outdoors and then install a heating pad. If the battery box is used in the garage, it probably won't get below 0 degrees and then there shouldn't be any problems, even with a heating pad. In your use with 18-20°C there should not be a problem. Greatings

[@davidpenfold]

@@derfreiemensch Thanks. I'm using a more rustic wooden setup.

[@mikybinns9343]

I've purchased 3 sets of 16 cells 280aH from qishou, they all perform exactly the same. Balance is very good all on JK 2amp Bms in parralel with other manufacturers cells. One came damaged and one came Bloated , they were replaced free of charge no problem. Ive had major problems with ogreen cells , deviation was 500 and 700mv difference and couldn't get more than 6kw out of a 14kw battery for this reason and they won't replace anything. Finally I've converted them to a 2p8s 24v system and added 2 active balancers in parralel... they are OK like that. My advice is stick to Quishou... top quality, and a great customer service Love your channel ❤ Andy apart from seplos stuff.... I can't watch anymore of that 💩

[@gavjlewis]

Variation. The MB30 sample is one of the best and the MB31 is probably an average sample (proof they are not sending you hand picked ones). What is important is you are constantly getting better than rated. Its good when Chinese companies are conservative with their numbers. Its gives you more trust in the product.

[@stephantitze8302]

Some more thoughts about compressing…. If I remember right, in older product specs for cells I found some data that the always mentioned compression of 300 kgf will extend the cycle capacity in some way. I don’t like to repeat all the pros and cons which have been considered in the past. In the new specs for the MB31 there is no more advice that compression will give benefit for cycle live. If I have overlooked something, please correct me. If I forget all the old stuff I can read just this: -quote- “When forming modules, a compression force in the direction of vertical thickness is applied to the cells in order to make them better arranged and fixed. If the compression force is too large, the cells may be damaged or even leak.” -unquote- They further recommend a compression force of 3000 N to 7000 N and give a warning that forces over 10000 kN (1000 kgf !) can damage the cell. In my own words they state: “Ok, if you need to give a force on your cells to fix it e. g. in your car, do it, but please not more than 700 kgf.” I can’t see any ‘must do it’. What we can see further down in the Appendixes is the description of the standard test conditions which is the same for all performed tests for all makers and all cells. Here we can find again the 300 kgf, 25°C, 12 mm steel plates and so on. For some tests this efforts make sense e. g. measuring swelling force of finally 6 metric tons or thermal runaway test up to 300°C. That means, that al the all the stated specs. are measured under this standard conditions. Measured values could be different without e. g. compression of 300 kgf or could be not. This is not part of the specs. Interesting is also further down in the chapter about swelling: -quote- “Customers shall consider the reliability of structural strength in the product design process, and it is suggested to reserve 2.0 mm ~ 2.5mm expansion space while grouping the cells.” -unquote- That’s what we have learned already earlier: You can compress at much you like, but you will never prevent swelling. You must have that space to avoid destroying your construction. Because at 60% SOH you may have that 6000 kg force in your casing. Another thing is that the stiff copper bars, which are delivered together with the cells can not compensate the these changes of distance between the terminals and will cause lateral forces to the terminals. If there is free space between the cells, they will remain in the origin position and stiff bars are OK. With a compression design I would use always really flexible bars. Lot of that above has been mentioned by Andy in earlier videos. I’m actually placing my new cells in the new self made shelves and I made already before the decision not to compress. With that new specs most of the remaining doubts are gone.

[@einzuschauer7647]

Hallo Andy. Du machst deinen Kapazitäzstest ja mit einem Entladestrom von 40 A. Ich finde nicht, dass man aus der Messung dann ableiten kann, dass die Kapazität der Zelle @08:52 "it is far over spec" ist. Laut Spec gilt die Kapazität ja bei 0,5 C, also > 150 A. Und mit höheren Strömen müsste doch die entnehmbare Kapazität kleiner werden. Oder?

[@HouseofBronn]

I have just ordered 20 mb31 from Docan Technology, Jenny Wu. She had told me there no mb30 available anywhere and they order direct from Eve and if you can find them they may be fake. But i was talking to Shenzhen Yixiang -Becky Liao and she said they have them so i was hesitant of ordering with them with the conversation and images they had, so I checked with Eve site and they have discontinued the Eve 306 mb30. Just to let everyone know from my recent order when i receive them i will do some testing

[@FutureSystem738]

Thanks Andy, love your work, love these tests. Keep on keeping on. Cheers and stay charged. 👍

[@sizercam]

Hi Andy, been watching your channel for a few weeks now. And I'm hooked on getting myself sorted to start building my first off grid setup. But how do i design a system, that i can start small an slowly build up? My aim is to run my heating an cooling off the system, but not just jump in the deep end of spending big cash.

[@OffGridGarageAustralia]

Start with one battery and some solar first. See how far you get with that. Keep in mind the future expansion and select the bus bars, cables breakers accordingly. Oversize them for now so you can use them later with an upgraded system and just keep adding batteries and solar.

[@neverenuffguns7646]

When you save your data and your curve grafts from the charger to your computer what software you save into? Or you just save it into your computer with what system? I’m new with this testing environment like you and I’m trying to figure it out. I like your data showing.

[@Mike-n8l2z]

Andy great video as always. One note about max discharge capacity of 0.5c (150A), seems very Low compared to LF series. Have you considered comparing this? I think the LF304 cells are 1c rated. Am I correct in my observation? If so quite restrictive if building a 12v battery. 2000w max inverter size.

[@gruetoo1]

Umm Umm.... The first one you tested was compressed I believe.... If this is true then you owe us a like minded test of the MB31 compressed. While the numbers my be the same I would still like to see. Chose a MB31 you haven't charged compress it, do your test. Please. Love your videos.

[@mampfi442]

Hi Andy, thanks for all your efforts, honest tests, opinios, data and of course the entertainment. A great channel from a great guy! Enjoy the donated S.P.A.T. 's Prost 🍻

[@bertiebassett3059]

Glad you have given these cells a test. I spotted them the other week on gobel powers shop but wasn't sure if they were legit as couldn't find any tests on them.

[@joesmith1142]

I bought an Epoch brand 300Ah 12 volt 4s1p battery last september here in the US. They use grade A EVE cells. The battery i ordered was built and put together last August. I cant open the battery to see exactly what cells were used, but when fully charged, my Victron smart shunt and monitor independently show the same result as the bluetooth app for the battery and show that they have a capacity of 316 amp hours. i know its not the most accurate way to determine capacity but it has been consistent. the battery has passive balancing but cell deviation drops to .002 - .001 overnight after an evening of moderate to light loads from the inverter. the cells your testing are most likely an even newer model so it wouldnt be unreasonable to expect they are off the shelf cells.

[@dean5263]

The MB31 was less expensive when I looked, now I know why. Could be a sign of an honest seller.

[@p337maB]

The maximum continuous discharge is of the M31 is given as 0.5P. Does this just mean 0.5C? What is the maximum burst discharge (e.g. 30 seconds) these cells can handle?

[@silverquattro]

I'd like to know this as well!

[@SkypowerwithKarl]

10,000 cycles? Damn, wish I had that many cycles left 😂

[@jimcisme1]

27 years at 1 cycle a day?

[@6vegan6]

Hey, Andy, I send greetings from your neighbor in the Czech Republic. Glad to hear you are planning to build a 12v battery from these new cells. I have been waiting for a long time when you will make some video about building 12V batteries, or especially about the best BMS to choose for such a battery. I mean some comparison of current 12V BMS. I wish to you lots of sunshine for hot australia.

[@YPSDZBatteryTester]

Nice Video! How about testing YPSDZ-0550 VS ZBC-040L?

[@sunshineossi]

Too bad Andy, I've already ordered 16 EVE LF280K HSEV from Gobel Power...😅 They've already arrived and my first video will be out tomorrow😉 But for now I'm saving up money. Because the EVE LF560K are next on my wish list 😜 Greetings from Germany 😎

[@NiueChannel]

LF280K v3 , by the manufacturer's specs rated for 1C continuous charge/discharge. By my opinion, if even we not going to use them under such high currents, anyway it's better because that means that under lower currents it potentially would give more lifespan than other cells which rated for 0.5C currents. Also good idea for testing is test discharge under constant power instead of constant current. It can show what a battery really can handle.

[@OffGridGarageAustralia]

Nothing wrong with the LF280K from GP. Great cells. Yeah, the LF560 will be interesting once they are available. But they may be too large for most people if they build a 48V system.

[@Luke_Wise]

@@OffGridGarageAustralia is basen lf280k cells any good, I've ordered 16 of them

[@DrivingPhilippines]

You're a good soul Andy. Appreciate your videos, and the excellent content you produce. 🙂

[@andrewt9204]

I'd love to see a compressed vs uncompressed capacity test. Maybe on some smaller cells though 😄

[@jws3925]

I was glad to hear he said he was still a "non-compression guy". I thought I recalled him doing some experimentation regarding this issue and found no difference in capacity. Of course this was (if I recall) based on just one cycle each of compressed and not compressed. I don't compress at this time based on that experiment. So, I would be most interested in more exploration of compressed vs non-compressed.

[@andrewt9204]

@@jws3925 yeah same here. I only charge to 3.5V to avoid expansion

[@stuartsmith945]

I doubt you would see a lot of difference. You are supposed to get more cycles with compression. You would have to do a lot of cycles before you would see much difference. Imagine cycling 2 sets of batteries for 3000 or 4000 cycles.

[@maxtorque2277]

Hi Andy, For air transport, cells will be required to meet UN38.3 standards and hence have to have a SoC of less than 30% during transport 🙂

[@TopEndSpoonie]

I am considering using these cells to replace the deep cycle batteries in my electric ride on mower. I would need to have 48V for it, but as the current deep cycle batteries are only 100A these will last a whole lot longer. The only thing stopping me atm is how these cells would go with vibration. What do you think about this? Thanks for all your awesome work. Cheers, Andrew.

[@Andrew28Lamont]

Is it possible that the MB30 measured higher be cause it was compressed and MB31 was not compressed, maybe you should compress the MB31 and run the test again, we might be surprised by a capacity of 350ah.

[@9111logic]

Nice one Andy, thanks for sharing 🙏 - these companies are pretty good indeed, when I tested my 3014A Duncan cells they all delivered in excess of 1000W each, and only one was 310A all the others were more and up to 314A max. One important aspect that you might like to know is that the Seplos 200E is keeping them perfectly balanced normally 0.2mv delta and it has done so from the moment I fired it up so I have not installed the Neey as yet, whether that is due to my careful individual testing cycles and top balance or not I shall never know.

[@almcpangit]

I am confused,, I have been trying to buy MB31 s from eve but they wont supply me as i cant pay in rmb, but they say MB31s were only produced "but it is at sample phase" they said, and mass production will only start second half of this year,,, so how is it that they are available from many sources? anyone know?

[@ericglaude4953]

As always excellent content and loved the air freight delivery! LOL. All this testing of batteries just wants to make me load up my garage with the same! Yikes, I better start watching some other channels as well, this channel is making me addicted to Off-Grid Garage! I guess that charging and discharging batteries along with drinking beer is good for the body and mind too! Thanks Andy as always.

[@bobsmyuncle4470]

Question Andy ? When you charge and discharge with your ZKETECH 40 amp tester do your 10 awg lead wires get hot like mine do?? And is this heat in the wires a loss of capacity that is not recorded or does the ZKETECH somehow record the power used to produce the heat in the wires?? Thanks

[@OffGridGarageAustralia]

No, they don't get hot. A tiny bit warm, less than hand warm I would say.

[@mechanicalsuntheoneyouknow]

Hi Andy,I’m Big fan of the channel and love your videos, I have a 24v system currently and thinking about upgrading to a 48v system and I have purchased 16 of the new MB31-314AH cells

[@AdventureMotoEnduro]

mine are still going strong eve 280ah cells 50 cycles are very stable and balanced ,so good love um

[@sjdtmv]

Bit colder down south over the border with 0.6 deg C this morning, jumper weather, winter is coming Andy, Temp has a lot to do with capacity, everything is based on 25 deg C testing

[@clarencewiles963]

Ok get your AC ready. Word will get out if you are being setup by supplying company’s. Thanks again for your work 😊

[@JohnMckeogh]

Gobel offer the same batteries with the 330+amp as QSO have sent to Andy . MB30 + MB31 are also the same weight Thanks for your fine work Andy

[@Chris-ut6eq]

A battery rating should be higher before the charge/discharge 10+ish times for this chemistry. If you were NOT getting 5-10percent higher on initial cycle , they would settle lower than rated. After 100+, you should be under rated but not a huge amount. There is some general data on the web showing capacity degradation graphs for LiFEPO4 over charge/discharge cycles.

[@sheldonnorthmore6147]

Hi Andy Just a heads up. Your calculation for curoof.current was incorrect. It should read 15.7 and not 15.3 on the mb31 by my reckoning. Hopefully you can get 350Ah out of them.😊

[@tombell8]

I just bought 4 x MB31 cells to make a battery pack, and charged to 100% using an itech world 40A charger. Have just attached my 40 litre Engel and set to -10 degrees to test capacity. The discharge amperage is 2.4 A and the remaining hours as shown on the BMS is 165 hrs or 396 AH. Not sure whether I should feel happy or worried! Any thoughts?

[@altmuligmannen3086]

Isn't it pretty obvious that that the labelling of the MB30 and MB31 must have been interchanged from the factory? Given the test results and also the QR-code reader that suggested so?

[@qaisehayati9373]

Very great review with expert explaination, you are real engineer ⭐⭐⭐⭐⭐

[@TrevorFraserAU]

Thanks again Andy for another great video!

[@typxxilps]

DOCAN Power and other have issues too , an alibaba supplier and they did not care.

[@albertogravina1023]

Ciao Andy, ti scrivo dall'italia. Ti faccio i miri complimenti. Dove posso comprare queste celle Eve con garanzia di grado A? Ti ringrazio e un saluto dall' Italia

[@albertogravina1023]

Hi Andy, I've just been following you from Italy, I have a 15 kw box with Eve cells, can you advise me on how to charge these lifepo4 cells? with bulk and float voltages or with the automatic communication cable? thank you

[@sirmonsterle]

Sounds you are short in energy. Are you sure you have enough pv panels?

[@joesmith1142]

"calibrate a Spat" I might steal that one from you and use that one when questioned...😀

[@Meiestrix]

I just looked at the QSO alibaba store and nowhere on the MB30 / MB31 pages the manudacturer of the cells is mentioned, thats a bit strange.

[@davidpenfold]

If they were trying to hide the original supplier they wouldn't call them MB30/31. It's probably just an oversight.

[@RayJohnson1980]

i would go to the mb30 for the cycles

[@Kolya83St]

Based on the results of your tests, is it better to buy mb30 batteries?

[@angyp74]

Hey Andy, I noticed you tested the MB30 compressed compared to the MB31 uncompressed. Do you think that may explain the difference in the expected capacity of the MB31?

[@paulsciberras5105]

Hi Andy I have just received my MB31 314ah cells and now want to fully charge them, I may have missed it somewhere but is it best to charge each cell individually or can i do all 4 cell together in parallel

[@mrballbreeder3749]

the capacity of new EVE cells adapts over time (mostly a month of use) to its rated capacity . Its normal to have much higher capacity on new cells . The LF280K starts mostly at 290 to 295Ah to stabelize at 280 to 285Ah . My EVE LF280K stabilized about 35 days on 20 cycles. Dont wurry about people telling about the biased youtuber . They dont know better.

[@OffGridGarageAustralia]

I never noticed any capacity loss over time when using any of the LiFePO4 cells.

[@sijtzevanderheide5294]

Hi Andy, i have used a qr code scanner. It is about the Eve MB 31.. is says cell type Lifepo4 (B). Does this means grade B cells?

[@tigiewig]

just posted the same question ..

[@jimcisme1]

Very interesting, as always.

[@WattsMiner]

Truth and Honesty in LiFePO4!

[@WEIMERANERZ]

Why do mb31 have .5 c rating and 280 ah have 1c?

[@hermanshim8948]

What keeps me here learning from Andy, "I don't know"

[@Richi42]

Hello, I just received my EVE LF280K cells and I was surprised to hear bubbles and like liquid in the batteries, is this normal? I scanned the engraved QR codes and I have the date 11/23/2023 produced in Jingmen. I am really very surprised by this noise which reminds me of a lead/acid battery?!!? They look like good but I'm really really surprised by this noise... hence my question 🤔🍺

[@MrElciupacabra]

Andy, have you tested REPT batteries until now?

[@HolWol24]

Was ist der gewichtsunterschied zwischen zwischen der MB30 und der MB31?

[@pjotter101]

Are there any available/active coupons for Alibaba? 🙂

[@Sean-vh8pm]

Last year we bought 16x cells from Docan and only 3 made 280Ah. Disappointed from cold and damp Scotland.

[@garys-half-baked-offgrid-dream]

Greetings from a soggy East Ayrshire 🏴󠁧󠁢󠁳󠁣󠁴󠁿

[@theo2378]

What's the values for those that didn't meet 280Ah?

[@Sean-vh8pm]

@@theo2378between 260Ah-275Ah. Docan were not interested in resolving it unless I sent the cells from the UK to China.

[@typxxilps]

@@Sean-vh8pm Thanks for sharing this story cause Docan power was our first supplier due to the channel from Texas. OK.

[@MarcinKowalski-n2i]

I am not impresed by Docan as well. I bouht 16 280k I had 2 cells that tested at 274Ah and e few other around 278-9Ah (tested with 20A only so thay all shuld test above 280). I asked for replacement of the 2 worst cells but thay refused. I Just got small refoud only. Some of the cells were actualy ok and around 290Ah, so 16Ah difrence between best and worst. My BMS has a lot of work becouse of that.

[@GregOnSummit]

6:43 : " ... no sponsorship on this channel ... ". Main reason I always come back to you Andy. No BS ... because of you I have a set-up where I can charge my '23 Bolt EUV with nothing but solar. Well almost ... battery capacity. But when I get my EEL V4 boxes I'll be 100% solar!! Speaking of ... when are you going to do a review of the new EEL V4 boxes, with just a breaker and the JK BMS?? We're waiting ... :)

[@peters619]

Me too…..hate all those other channels trying to sell me a set of steak knives, health shakes, news services or VPN….lots of garbage out there and reminds me of the Truman Show

[@OffGridGarageAustralia]

I've got an EEL V4 incoming. It can take a while until it arrives but I'm keen too to check it out.

[@DO5MZ]

Danke für den kleinen Test der Batterien ich werde die MB30 für meine Gartengrundstück bestellen mit 8 Stück habe ich dann genügend Kapazität zum betrieb des Repeatres auf 70cm

[@camjones1106]

Could i Put these into an SOK 48V ?

[@wayne8113]

Thanks Andy

[@alcree7572]

Great video again :) I would love to see you do the Gotion 340Ah cells! I have version 1 from 2022 already from GobelPower and they seem to have the capacity stated although they were old new stock and I have 2 runners out of 24, but they have a newer version 2 now, which I saw someone say they got 360Ah+ from them, can you test this!? ; )

[@maxtorque2277]

If you measure the dcIR for the cell you can estimate the resistive losses during charging and discharging. Lets say the dcIR is about 2mOhm. FOr 40amps current thats a power loss of 3.2 watts (I^2r). It took 16 hours to charge then discharge (or viseversa) so energy lost is 16 x 3.2 = 51Whr. So broadly, if you put in 1kWh to the cells, you could expect to get 950Wh out.

[@rcinfla9017]

DCR is a combination of ohmic resistance (close to 1 kHz impedance test, 0.18 milliohms for MB31) plus the overpotential voltage drop at given cell current. It is not really a resistance. It is dominantly the overpotential voltage required to push the lithium-ion migration at a rate to meet cell current demand. At 40 amps discharge current the terminal voltage drop due to overpotential at equilibrium is about 50 mVdc for a relatively new 300 AH, thick electrode cell. That would be an equivalent apparent resistance of 0.050v / 40A = 1.3 milliohm. Overpotential voltage has a logarithmic relation to cell current demand. The spec has DCR taken at 1 C(A) current after 10 minutes of load to reach equilibrium on overpotential drop (excessively long time given to reach exponential time decay equilibrium). 1 C(A) is pretty rough test for overpotential on a thick electrode cell. Ion starvation for the thick electrode cells starts at about 0.5 C(A) of load . At high cell current demand, the lithium-ions migration rate density reaches a point where the diffusion through electrolyte and electrode material is starved out requiring additional overpotential voltage to push harder on the curtailed lithium-ion migration to maintain a mass migration rate necessary to meet cell load current demand.

[@galax64]

How many kWh do you have prismatic cells ?

[@orbitsonneumeister5155]

Hast du den internen Widerstand bei den MB31 gemessen? Ich dachte der ist bei den MB31 niedriger als bei den MB30. Habe vor 2 Wochen MB31 bestellt aber dauert noch…

[@kchortu]

I think the difference between the 30 and 31 is mostly marketing when you look at the cycle degradation, with the expectation that they would settle out at the nominal storage will eventually be around the 306 for the mb 30 and with the less cycles of the 31 they can rate the nominal storage at 314 especially considering they are both new and being launched at the same time. I ordered the mb 30 as they are slightly cheaper and I would bet money they are the same inside and just have different spec sheets.

[@ATLHometownAtlantaFalcons]

Hi i just subscribed to your channel ........i am about to buy for 90$ should i do it

[@OffGridGarageAustralia]

Welcome to the channel. $90 seems to be a fair price.

[@CoryRobson]

For those of you that have ordered from Alibaba (Andy feel free to also chime in) but obviously for orders of 16 cells or more are exceeding the Personal import rate (So i have been advised) what are you paying if anything on top of the the order once the goods hit aus?

[@johnjamce1146]

i bought some EVE cell an it got liquid shaking in it have you ever got that

[@AB-yt4hd]

I have bought 48 EVE MB31 cells and didn't have any liquid shaking in them.

[@HybridShedIraq]

Actually, i received a batch from mid-October they are 3rd gen terminals 280k with measured capacity of 317 AH 😅.

[@tigiewig]

Hi ALL just got 16 MB31 delivered , the code is reading. cell type LiFeP04 (B) are these grade B cells ? thanks

[@tigiewig]

found the answer on (Yixiang Batterie Consistency Test and how to identify problem cells.) Btw, the (B) showing in the QR code scanner means LiFePo4 chemistry. Developer confirmed

[@Rostol]

Dear Andy, whatever they do with the batteries they need to respect the C rating. so a charge discharge cycle takes ~16 hours. 1000 cycles test will take 666 days of full 24/7 cycling

[@davidpenfold]

It would be cool if you could test them in a temperature controlled environment (20, 25°C?) to test like for like.

[@nathoilboy2053]

Hey Andy i can't find the direct air drop shipping on the Web site😂😂

[@SomethingGood56]

Only one problem what i see is i cant charge/discharge with 1c.

[@stephsoltesz6731]

Dear Andy, It's great that you are measuring the Gross Capacity (3.650 -> 2.50) but the reality that no one takes their packs from 3.650 down to 2.500 is NOT realistic and mpt Real World. Gross will typically be 10% higher that the rating which is based on working range. Could you PLEASE charge the cells to 3.450 till Amps taken drops to (AH x 0.05) Endamp value, allow to settle for 1 hour and then discharge to 3.0V per cell. Just like your LIVE WORKING PACKS. These cells are rated for ### AH which is derived from the "working range" as you well know.

[@jukkapekkaylitalo]

It is all about C rating. I bet if y could charge and discharge those batteries with 1 C MB30 would have 306 ah and mb31 314ah. Mb31 also has less charge cycles because higher max discharge current.

[@martincaniaux6722]

hi, interesting what you say, because we have trouble understanding the interest of releasing cells that are so similar. On the other hand, on the mb31 documentation, the charge must not exceed 0.5p. So what is this unit of measurement? 🤔 can you tell me in amps what that does? Thanks 👍

[@jukkapekkaylitalo]

@@martincaniaux6722 1C i discharge of 1 times the Max Amps of the cell 0.5 C is discarge of half times of max amps of cell. 2C is 2 times the max Amps of the cell and so on if your cell is 314 amp 1C is 314 amp if the cell is 306 amps 1C is 306 amps.

[@martincaniaux6722]

Thanks but I knew that 😊 What I don't understand is why EVE now uses the letter "P" and not "C"

[@OrtexVideos]

Maybe they are the same cells but the MB31 is "rated" for fewer cycles with a higher capacity because it will reach less than 80% SOH sooner due to its higher initial rating 🤷‍♂️

[@claytonmccarter4532]

I have older eve 315 cells tested all 8 when I received them and all come over rated capacity average was 330ah

[@OffGridGarageAustralia]

EVE 315?

[@paulcurtis5496]

Like# 398?

[@jogi_54]

Maybe - the cells are both the same: can be?? MB 30 after 10.000 cycles 306AH and MB 31 after 8.000 cycles 314AH possible: MB 30 after 8.000 cycles 314AH and MB 31 after 10.000 cycles 306AH - what do you think ? for me, it makes sense LG jogi

[@davidpenfold]

That's rated to 70° capacity. So, maybe they can extend the number of cycles by artificially lowering the initial capacity. Seems strange, but maybe longevity is a better seller than pure capacity? 🤔

[@jogi_54]

@@davidpenfold The values are garanteed cycles. 8years ago, I found a cycle test of the yellow Winston LiFeYPO4 cells, which made 11.000 cycles with less than 5% degradation.

[@davidpenfold]

@@jogi_54 His last video went through the specification document from EVE. It's guaranteed 70% capacity. It's interesting because previous batteries had lower guaranteed cycle numbers, but to 80%.

[@jogi_54]

@@davidpenfold the value for "%" capacity and the number of cycles depend on each other. The cells will still work down to 50% capacity and will have maybe 15.000 cycles to reach the 50%.capacity. Newer generations will be better, so to compare them, will only tell you, the newer ones are a little bit better.

[@davidpenfold]

@@jogi_54 Of course. I'm just stating the rated capacity after 8000 cycles (70%) for these batteries, that is contained in their specification document.

[@lloydfairweather6070]

my lf235 cells dont have cobolt

[@croftegan7993]

16 of MB31

[@FlorinUrzica]

Greetings from Romania !

[@Juergen_Miessmer]

Hmmm...maybe MB30 and 31 are the same cells? Just diffrent labels and QRs....

[@maxtorque2277]

Worth noting that these days chinese cells are really high quality, simply due to the volume they are produced in. Companies like EVE make GWhrs of cells each year, cells tumble off the end of the highly automated line at a massive rate. They simply can't afford poor quality or large variablities when making cells at this volume. So i'm not at all surprised that the cells are pretty good. In all honestly, whilst some of the specs claimed might be a bit "optimum" especially in terms of lifecycle, you do tend to get a constant quality cell from these chinese manufacturers when you buy new cells. More of a problem is second hand / second life / conterfit cells etc. Those i would suggest are rather varriable......

[@USA-GreedyMenOfNoIntegrity]

Jenny Wu at Docan provided my Apexium diy battery kits , JK BMS and MB31. 330 Ah tested. IR= 0.022-0.024 mOhm.

[@Mattvbro]

Mabey they are actually the same cells but they say one has less cycle life so they can slap a higher capacity number on it. so in reality a 306ah would have the same actual capacity at 8000 cycles as the 314ah would

[@mflo1970]

Ohh good video as always