Aridom82
Learning addict
16x Qishou 304 ah Lifepo4 batteries just arrived, i think i got scammed.
They have a weird bump on top. Are these defects important?
They have a weird bump on top. Are these defects important?
New Qishou 304 ah Lifepo4 batteries just arrived, i think i got scammed. Are these defects important?
- Thread starter Aridom82
- Start date
houseofancients
Solar Wizard
Did you ever consider talking to them first before you started posting ?
Aridom82
Learning addict
Not really. I dont expect honesty from people i suspect to be trying to trick me, and i imagine here there are people experienced on this stuff that may have insight on what these pictures reflect.
I take your comment more as an abrasive response than help and i dont appreciate that.
houseofancients
Solar Wizard
What gives you the idea that they are trying to trick you ?
Have had plenty of qishou cells and when shipping or other issue arrive they have always been happy to make it right...
Instead of whining and insinuating common sense and decency would tell you to first contact them and ask them what is up..
And for what it worth, the cells look fine based of the pictures you posted, I suggest you test their capacity and go from there
Aridom82
Learning addict
You sound like you are having a very bad day i would rather not discuss this with you thank you
lexio
feel the balance 3.65
No they are not important.
maybe you can capacitytest them all of them
please give us a report on that one
also the ariving voltage
internal resistans
maybe you can capacitytest them all of them
please give us a report on that one
also the ariving voltage
internal resistans
Aridom82
Learning addict
Thanks, i am going to make capacity test on 4 of them. It takes a very long time to charge them with my small power supply so it will take some days to complete. They arrived at 3,29v all. The internal resistance i cannot check my tester is not sensitive enough. They have a declared 0,25 milliohm internal resistance.
Aridom82
Learning addict
So i just learned that the internal resistance can be measured by the formula (no loaded voltage-loaded voltage)/current.
According to this formula, the internal resistance on three cells are 0.02, 0.025, 0.022 so it seems to be ok
littleharbor2
Solar Addict
I found if I series wire 4 cells at a time I charged 4 times faster. Set the power supply at 14.4 . Take the cells off as soon as the current starts falling then parallel wire the cells and finish at 3.65
Aridom82
Learning addict
That sounds about right. I am going to do that now
lexio
feel the balance 3.65
if you do this trik please use a bms
Aridom82
Learning addict
I just blew my jk bms in spectacular fashion so until the new one arrives i am going to check every hour or so the voltage of each cell and be sure they are below 3.35
lexio
feel the balance 3.65
your waranty is now void and nill
use a bms or stop
use a bms or stop
Aridom82
Learning addict
ok... can i charge one by one without bms and still have warranty?
littleharbor2
Solar Addict
Really?! I didn't realize there was a BMS police force.
Alkaline
Solar Wizard
You can also remove the black covering around the label to see what is going on, it should be clear without any sanding marks or difference in color. Use rubbing alcohol to slowly dissolve the glue, don't use a scraper.
Laslty you can ask the seller for a test report.
Laslty you can ask the seller for a test report.
Alkaline
Solar Wizard
see this thread, if you see sanding marks around the qr code, then yeah you got had, if NOT then I think you are probably ok. I test report would still be nice to alleviate all fears.
diysolarforum.com
Docan Power bad experience, beware.
Hello! Having read here on this forum a lot of positive feedback about Docan Power decided to buy from them on Alibaba. Ordered 84pcs of Eve LF280K cells from Docan in January. Sales rep was Jenny Wu. Cells were sold as "brand new Grade A". I paid almost USD12K for them, USD141 per cell...
diysolarforum.com
Aridom82
Learning addict
Very very good thread, a lot of useful information in there with pictures, thanks a lot.see this thread, if you see sanding marks around the qr code, then yeah you got had, if NOT then I think you are probably ok. I test report would still be nice to alleviate all fears.
Docan Power bad experience, beware.
Hello! Having read here on this forum a lot of positive feedback about Docan Power decided to buy from them on Alibaba. Ordered 84pcs of Eve LF280K cells from Docan in January. Sales rep was Jenny Wu. Cells were sold as "brand new Grade A". I paid almost USD12K for them, USD141 per cell...
I am going to wait until tomorrow morning to peel the top of one so i have the best light to check the qr code
In the meantime the first capacity test on the first cell should be done, i will let you know
Aridom82
Learning addict
I am happy to announce that these Qishou 304 ah cells are pulling 314-316 ah at 20 amps discharge.
The defects are just cosmetic imperfections, cells are more than fine
The defects are just cosmetic imperfections, cells are more than fine
houseofancients
Solar Wizard
So maybe I wasn't having such a bad day before..
Measure first, then talk to supplier on issues, then post
Measure first, then talk to supplier on issues, then post
