Dongguan Lighting: Purchase 280AH LiFePo4 cells. Purchase & Review

[BiduleOhm]

To my understanding Galvanic corrosion doesn't need air or water to occur.
Just the 2 metals is enough.

I find this image very nice to understand how galvanic corrosion works. Also, by definition any corrosion needs oxygen from somewhere to happen.

 

[Frank in Thailand]

I find this image very nice to understand how galvanic corrosion works. Also, by definition any corrosion needs oxygen from somewhere to happen.

Yes I don't think there will be much new rust out in space...
Lol

If the microscopic thin layer of zinc coating on threaded rods is enough sacrifice metal to stop Galvanic corrosion to be a problem, then perhaps I'm making a big fuss about nothing?

I've seen aluminium engines being eaten from the inside due galvanic corrosion.
Moving water with metal particles and copper radiator doesn't end well for the engine, in just a few years.

Perhaps the most optimal situation for galvanic corrosion.

Lead acid battery (AGM, Gel type, no acid fumes) inside the car (Citroen picasso) getting all nice colours on the leads in 2 years.
and needed cleaning every year.

Not cleaning gave all kinds of strange computer related problems, air-conditioning would sometime stop working, LPG system the same.

The battery was under the drivers seat...
Perhaps my fumes..... ?..

That is my real life experience with galvanic corrosion, and I'm not looking forward to clean every few years the terminals of the cells.

Am I making a big fuss about something that isn't a real problem With this setup??

 

[BiduleOhm]

If the microscopic thin layer of zinc coating on threaded rods is enough sacrifice metal to stop Galvanic corrosion to be a problem, then perhaps I'm making a big fuss about nothing?

Yes it is, but only for a certain amount of time, when there's no zinc left it's game over.

Perhaps the most optimal situation for galvanic corrosion.

Besides industrial installations using acids etc... I think the most destructive corrosion wise is marine environment; sea water will destroy almost everything.

Lead acid battery (AGM, Gel type, no acid fumes) inside the car (Citroen picasso) getting all nice colours on the leads in 2 years.
and needed cleaning every year.

Not cleaning gave all kinds of strange computer related problems, air-conditioning would sometime stop working, LPG system the same.

Try covering the terminals (NB: here I mean terminals = battery post + wire lug after they are assembled together) with dielectric grease (same as silicone grease) after you clean them, the next time you do it.

Am I making a big fuss about something that isn't a real problem With this setup??

Well it's important to be careful but don't get too hung up on this problem, especially before it's even a problem for you. Just do a nice job (sand, clean, and protect) and it should be ok. Keep an eye on them every few months just to confirm everything is ok and take action if it's not

 

[Woodey]

Just pulled the trigger on 8 280AH cells. Choices were Lishen 272ah usd65.86, Eve 280ah usd75.45/pc or we have also 3.2v202ah Lishen price usd50.43/pc. shipping cost for 4pcs usd74.8; for 8pcs usd119.8; Shipping by sea+to door, shipping time Appro. 35days End up withe the 272ah for $65.86 plus $119.80 Shipping for a total of usd65.86*8pcs+usd119.8 =usd $646.68 To California. This includes bus bars & bolts. Still need a BMS for a 12v system for my RV.

 

[Dzl]

Just pulled the trigger on 8 280AH cells. Choices were Lishen 272ah usd65.86, Eve 280ah usd75.45/pc or we have also 3.2v202ah Lishen price usd50.43/pc. shipping cost for 4pcs usd74.8; for 8pcs usd119.8; Shipping by sea+to door, shipping time Appro. 35days End up withe the 272ah for $65.86 plus $119.80 Shipping for a total of usd65.86*8pcs+usd119.8 =usd $646.68 To California. This includes bus bars & bolts. Still need a BMS for a 12v system for my RV.

It still amazes me how affordable prices are now if you are willing to shop around, assume some extra risk, and DIY.
7.2 kWh for the price of a single 1.2 kWh Battleborn (once you factor in the cost of a BMS, the materials to secure/compress, and test/balance, the pack). Of course you are not getting matched and tested A grade cells, and you don't get 10 years of warranty and support from a reputable US based company, but still, the value is staggering if you get healthy cells.

 

[Woodey]

More info on the supplier

https://protettore.en.alibaba.com/?spm=a2700.12243863.0.0.636f3e5fvEZDsK
Thanks for your inquiry on Alibaba. We specialized in lithium battery for 6 years.
3.2v280ah-usd65.86/pc;
3.2v200ah-usd47/pc;
3.2v120ah-usd35.3/pc;
3.2v100ah-usd29/pc;
Shipping cost to Santa Rosa, California USA 95405 I will quote you tomorrow.

Paula

 

[Gazoo]

The 280ah (272ah) cells are Lishen cells and not EVE cells. Just in case you were not aware.
The EVE cells are $75.00 each.

 

[Woodey]

The 280ah (272ah) cells are Lishen cells and not EVE cells. Just in case you were not aware.
The EVE cells are $75.00 each.

Correct , I picked the cheaper Lishen at $65 because they were a better value on a total unknown by me.

 

[rgmaninit]

Just pulled the trigger on 8 280AH cells. Choices were Lishen 272ah usd65.86, Eve 280ah usd75.45/pc or we have also 3.2v202ah Lishen price usd50.43/pc. shipping cost for 4pcs usd74.8; for 8pcs usd119.8; Shipping by sea+to door, shipping time Appro. 35days End up withe the 272ah for $65.86 plus $119.80 Shipping for a total of usd65.86*8pcs+usd119.8 =usd $646.68 To California. This includes bus bars & bolts. Still need a BMS for a 12v system for my RV.

Hi, is this from Dongguan lightning? I purchased Lishen 272ah recently, but price is bit higher - $72 per cell

 

[lexio]

where : Dongguan Lightning New Energy Technology Co., Ltd.
what : 4pcs/pack Lishen 3.2V 272Ah 280Ah Prismatic Lifepo4 Battery *2
price: $ 78 cell totall USD 624.00
transport: netherlands DPP USD 245.00
Order Date: 2020-11-07 01:30:35
not arived yet

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[lexio]

where: Shenzhen Basen Technology Co., Ltd.
what : BASEN 4pcs Lishen 3.2V 272Ah Rechargeable Lifepo4 Battery
price: USD 75.20 cell totall USD 300.80
transport : netherlands DPP USD 134.41
Order Date: 2020-11-05 11:19:17
not arived yet

 

[100kwh-hunter]

@lexio,
Next time you or me are ordering we team up.....
I presume the 11 is november in there date, becouse may or juli sound a little to far back.
Give them a other 4 weeks before getting a hangover.
Would love to see those cells and test them.


To all, i recently discovered that EVE and BLS have or are the same manufacturer...Both sell what they discripe: new, A grade or A grade or otherwise....

Best Igor

 

[100kwh-hunter]

Hey, quick question for all of you with lifepo4 280ah cells........... lets say you charge your batch to 3.35V and then let them rest, has anyone checked their rested voltage 1 day later, 2 days later, etc? What would you expect your voltage to be? Can we use the voltage to figure out the soc? I still don't have my load tester yet

SOC Cell V 12V setup 24V setup 48V setup
100.00% 3.650 14.60 29.20 58.40
99.50% 3.450 13.80 27.60 55.20
99.00% 3.375 13.50 27.00 54.00
96.00% 3.363 13.45 26.90 53.80
90.00% 3.350 13.40 26.80 53.60
80.00% 3.325 13.30 26.60 53.20
70.00% 3.300 13.20 26.40 52.80
60.00% 3.275 13.10 26.20 52.40
50.00% 3.263 13.05 26.10 52.20
40.00% 3.250 13.00 26.00 52.00
30.00% 3.225 12.90 25.80 51.60
20.00% 3.200 12.80 25.60 51.20
14.00% 3.150 12.60 25.20 50.40
9.50% 3.000 12.00 24.00 48.00
5.00% 2.800 11.20 22.40 44.80
0.00% 2.500 10.00 20.00 40.00

Let them sit for 14 days connected in parallel without psu, then disconnect, then let them rest for a other 14 days (30 days is more welcome!), this will tell you a bit of there health....v drop of 0.5 in 14 days....could be a bad cell.
get a good ir tester like the yr1030, seek for fabrication specs, this is something i would do!

 

[100kwh-hunter]

My cells are have reached Europe, Poland, apparently.
I'm having 2nd thoughts about one issue... the first set had some minor voltage differences, so Rain presented me with a 2nd set of cells, closer in voltage. But the voltage of the 2nd set is higher. The first cells were around 3.29V and the second are near 3.33V. What do you think about this? Maybe the same cells and they charged them??? Internal resistance is not very different, 1st to 2nd.

I'm worried now that the cells stay too long at a high SOC... should have noticed this before...

as long as the ir is in fab specs dont worry about the v! or capacity

 

[100kwh-hunter]

Personally, I like to see /monitor what's going on under the hood.
That's why I'm about to order also the smart 250A, to use together with the"not smart" BMS.

That is not the way how it works, order a 500A bms or order a sytem that can handle A LOT more like batrium

 

[lexio]

@lexio,
Next time you or me are ordering we team up.....
I presume the 11 is november in there date, becouse may or juli sound a little to far back.
Give them a other 4 weeks before getting a hangover.
Would love to see those cells and test them.


To all, i recently discovered that EVE and BLS have or are the same manufacturer...Both sell what they discripe: new, A grade or A grade or otherwise....

Best Igor

you almost live next door will keep you posted yes and it is November.
1 set 12v for rv and 1 set for 24v off grid house in France ( friend of mine )
they say expect 50 days of transport time. will be nice to have hem before new year so i can test but i will see.

 

[100kwh-hunter]

That's why I am not happy to top balance.

Bottom balance might be more logical option.
I have discharger for 150w, that can be used per individual cell

If what you say is true, a parallel set of 3 can have 3 different SOC between the 3 cells.

I read about people who say you should go down to 2.0 volt, and people who say you absolutely should not go below 2.5 volt.

The first group does say you should not leave them at 2.0v, but recharge them asap. A few days will damage

With bottom balance you will wear your cells out faster, due to dendrite forming.
If people say that they go with there lifepo cells below 2.5v they use a rather high c rater or pushing there luck about the cycle life.....
stay within 2.55 to 3.55v

 

[100kwh-hunter]

The first group does say you should not leave them at 2.0v, but recharge them asap. A few days will damage

The second group more or less say the same, but leaving at 2.5 for a few days doesn't damage.

As both is possible, and there are watts between the both, neither of them is 0%

It's possible to discharge to 0 volt.
Then the SOC is indeed 0%

no insult: but you need to do a lot more studying

 

[100kwh-hunter]

Even adding new cells in parallel to old pack to boost the life is common practice!!

As lifepo4 doesn't drain other cells like Lead acid does, you can have "bad cells" mixed up with good ones!!

A "bad" old cell just doesn't have the same capacity, and for longer period of time it can have more difficulties to hold the charge.

Bingo, bulls eye...but as long as youre strings match in the same capacity....

 

[Gazoo]

To all, i recently discovered that EVE and BLS have or are the same manufacturer...Both sell what they discripe: new, A grade or A grade or otherwise....

Are you implying BLS manufactures EVE cells? It's my understanding BLS doesn't manufacture anything. If you have any facts to prove otherwise I would be interested.

The suppliers advertise cells as grade A but we have found EVE cells are not grade A. Some have tested at 265ah. The only way to be sure an EVE cell is grade A is to order directly from them. They are still a good value when ordering from a supplier. A grade A cell ordered directly from EVE is around 2X the price as opposed from ordering from a supplier.

The supplies of EVE cells has kinda dried up so suppliers are now selling Lishen 272ah cells. Whether or not they are grade A remains to be seen but test results so far are promising. At least they match the advertised capacity but the tested ones are not all 280ah or greater as the suppliers are claiming.

Also FYI you are replying to posts that are months old. Nothing wrong with that but much has been learned about these cells in the past 6 months or so.