You really need to watch out. I have bought lots of stuff from AliExpress without any major difficulties...untill NOW!
I bought 16 cells advertised as "Brand new Grade-A 200 Ah CALB LiFePo4". They came with app. 2 months delivery time and was packed very nicely 4 in each 4 boxes.
I instantly put them on charge to max. 3.65V and then initiated capacity tests.
2 cells had 150Ah, only 1 cell reached 174Ah, the rest were between 158 to 168Ah, and 1 cell was slightly swollen.
Seller tried all kinds of tricks to avoid admitting what was obvious:
Cells could not have been new. CALB would never send out cells so far from specs and certainly never swollen cells, moreover CALB stopped using the center ventilation caps present on my delivery 12YEARS AGO !!!
Swollen cells are directly dangerous potentially catching fire, from dendrites developing inside. This may happen over several years of use.
I don't know about all stores, but many use exactly the same pictures and texts, so difficult to know who is honest and who is not.
If you don't have and understand how to make proper capacity tests straight after arrival, DON'T BUY. A voltage of 3.3V is no indication of SOC or capacity, it is simply the resting voltage of a partially charged cell. after you have put them together in a bank and started to use them there would be no way of getting your money back.
My experience was with OYE store, stay far away from them !!! They don't refrain from anything to avoid any form of compensation!
Best regards
I bought 16 cells advertised as "Brand new Grade-A 200 Ah CALB LiFePo4". They came with app. 2 months delivery time and was packed very nicely 4 in each 4 boxes.
I instantly put them on charge to max. 3.65V and then initiated capacity tests.
2 cells had 150Ah, only 1 cell reached 174Ah, the rest were between 158 to 168Ah, and 1 cell was slightly swollen.
Seller tried all kinds of tricks to avoid admitting what was obvious:
Cells could not have been new. CALB would never send out cells so far from specs and certainly never swollen cells, moreover CALB stopped using the center ventilation caps present on my delivery 12YEARS AGO !!!
Swollen cells are directly dangerous potentially catching fire, from dendrites developing inside. This may happen over several years of use.
I don't know about all stores, but many use exactly the same pictures and texts, so difficult to know who is honest and who is not.
If you don't have and understand how to make proper capacity tests straight after arrival, DON'T BUY. A voltage of 3.3V is no indication of SOC or capacity, it is simply the resting voltage of a partially charged cell. after you have put them together in a bank and started to use them there would be no way of getting your money back.
My experience was with OYE store, stay far away from them !!! They don't refrain from anything to avoid any form of compensation!
Best regards