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Help Required - AliExpress Lifepo4 battery dispute

pretty sure oreilys auto parts has free battery tester that will do a print out of battery specs.
Lol well.

Nice thought, but that's totally different than what we're doing here.

That will not give you a capacity test and I'm pretty sure it's not even safe to use on lithium.
 
Lol well.

Nice thought, but that's totally different than what we're doing here.

That will not give you a capacity test and I'm pretty sure it's not even safe to use on lithium.
And I don't fancy travelling to the US to do it anyway!
 
Well I had a oreilys auto part have the print out showing ton specs based off batteries. One was ah reading. Showed 30 ah out of 70 ah rated battery. This was few years ago. It all depends tho what store. Some mainly have based good or bad test. Some have print out spec test. But ya lithium might not even work on test.
They can't possibly give you AH readings unless the test takes a substantial amount of time.

Pulling 1C from a battery takes an hour, an lead acid batteries should not be done at 1C.
 
Those meters don’t measure Ah’s, but you have to set them (or the cranking amps rating)

They measure the internal resistance and calculate the maximum cranking current based on this, and show a percentage of its rated capacity

Cranking amps determine (globally) the state of the battery, since those are the main factors for a starter motor.

Doesnt apply to lfp, you need to do an actual capacity test for proper measurements
 
This is the monitor I used that Aliexpress say isn't up to it 929444.jpg
Which is a little odd, as they sell them.
 
Aliexpress doesn't sell anything, it's a platform. Sales are done by sellers, just like someone using Amazon Marketplace to sell their products.
 
Look up the specification sheets of the high capacity LiFePO4 cells and look at the energy density. Use these sheets to prove the energy density of the chemistry and thereby claim fraud on the seller's advertised capacity. Or can just google some research papers on lithium energy density.
a standard 280Ah 3.2v cell from EVE weights about 5kg. So for that capacity you'd need 20kg in batteries alone.
The seller on their site claims 12v 300Ah, which is taken to be 300Ah at 12v, so the fraudulent intent is definitely there.
 
Been offered half my money back, and I keep the battery, OR all of it back, but I need to return the battery to China.

Given half the cost is £126, and it's £86 to send it to China, I'm wondering if I can be bothered to post it back.. for an extra £40.
 
It is unfortunate but that is a better result than some. If you have no use for it and sell it as a 100ah battery hopefully you could recoup more than what you would net by sending it back.
 
It is unfortunate but that is a better result than some. If you have no use for it and sell it as a 100ah battery hopefully you could recoup more than what you would net by sending it back.
yep. Feels like an offer I should accept, other than this effectively allows the company in China to make a profit from their fraudulent operation.
 
I don't mean to sound harsh as one UK guy to another, but did you not read the reviews for that battery and seller on the Aliexpress store from the link you sent, 90% of the reviews explicitly state that its nowhere near 300Ah the most someone got was 96Ah
 
I don't mean to sound harsh as one UK guy to another, but did you not read the reviews for that battery and seller on the Aliexpress store from the link you sent, 90% of the reviews explicitly state that its nowhere near 300Ah the most someone got was 96Ah
This actually is as condemning of aliexpress as it is of him, the fact that there are many saying the same thing and ali wants to jerk him around for using an improper tester (but don't get me started on him not charging it properly, or discharging it fully)
 
I agree with others, cut your losses as if you ship back ensure to pay insurance and tracking otherwise if it gets lost and not received by seller. I have read posts of that happening.

From these cheap batteries, the reviews I read indicate 3 out 4 transaction did not go as planned.

If the price is too good to be true it probably is. I fell into same trap. I believe I was lucky as the tracking ended at the export port and after 3 months of waiting I got Aliexpress refund for non delivery. Once you get delivery I just keep reading of all the hoops to jump through to get a refund which is not guaranteed.

I would post it locally for sale for a week before trying to send back. You might end up with more money in your pocket.

It is up to you but they p r on ably have done the same to many others and I get feeling the odd one who complains does not really impact them. Send it back, they will just ship it to the next customer who orders it. Sad but our western ‘customers service’ does not apply in other parts of the world.

I personally am not buying cells from Aliexpress as to me it is too much of a gamble with little recourse if it goes bad.
 
I don't mean to sound harsh as one UK guy to another, but did you not read the reviews for that battery and seller on the Aliexpress store from the link you sent, 90% of the reviews explicitly state that its nowhere near 300Ah the most someone got was 96Ah
Sadly when I ordered it in July there were zero reviews.
 
Been offered half my money back, and I keep the battery, OR all of it back, but I need to return the battery to China.

Given half the cost is £126, and it's £86 to send it to China, I'm wondering if I can be bothered to post it back.. for an extra £40.
Take half the money and move on. You will not get more buy shipping the product back.

Don't forget to leave an honest review once the money is returned. Just the facts, be nice.
 
Take half the money and move on. You will not get more buy shipping the product back.

Don't forget to leave an honest review once the money is returned. Just the facts, be nice.
I took half the money and moved on. Lesson learnt. I now have a roughly 80ah 12v battery to use somewhere.
 
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