Diysolar123
Solar Addict
- Joined
- Feb 28, 2021
- Messages
- 675
unless you like gambling of course hehe
ordered 8 - 280AH cells for $850 and after a few months they arrived. packing was ok, however, several cells were pregnant by 6mm or more, still I tested all 8 of them using a battery capacity tester, fluke meters, ISDT chargers (calibrated), etc. at a 20Ah rate.
Its not like you need NIST certified gear to measure battery capacity that is off by 20%.
7 of the 8 were 270-280 so thats fine, however, one cell was only 215 on first test. Sent them a message rather that start a formal dispute that the cell was low and they said test again, make sure to test in isolation. So I did another full charge/discharge...and then another just to make absolutely sure. The cell was certainly below 230AH. They then went quiet on the message center.
So I start the dispute via aliexpress and here is where it gets "fun"...
The ONLY evidence they will accept that a batteries is defective if:
1)a professional battery load tester with calibration certs (you cannot use one of the 150W capacity units, probably one of the $400 units would be ok, maybe)
2)a video of the entire 24hour long test for the complete full charge and discharge cycle..which MUST be less than 500mb so it meets the aliexpress upload limit (maybe 320x240 video would fit if highly compressed but you would not be able to actually read the displays).
if you cannot meet those requirements, they will offer $20 which the aliexpress dispute team will agree with as you cannot/did not meet the liitokalavaricore store test requirements.
I would recommend anyone buying to avoid them on aliexpress and consider joining one of the group buy threads here on the forums.
sadly I found this forum just AFTER i made my order. The prices are not worth the trouble...
As we are all here to share triumps and warnings...I am sharing this warning (and I bought a replacement cell for my 8S string using one of the group buy threads as well as another 8 cells for my second string).
ordered 8 - 280AH cells for $850 and after a few months they arrived. packing was ok, however, several cells were pregnant by 6mm or more, still I tested all 8 of them using a battery capacity tester, fluke meters, ISDT chargers (calibrated), etc. at a 20Ah rate.
Its not like you need NIST certified gear to measure battery capacity that is off by 20%.
7 of the 8 were 270-280 so thats fine, however, one cell was only 215 on first test. Sent them a message rather that start a formal dispute that the cell was low and they said test again, make sure to test in isolation. So I did another full charge/discharge...and then another just to make absolutely sure. The cell was certainly below 230AH. They then went quiet on the message center.
So I start the dispute via aliexpress and here is where it gets "fun"...
The ONLY evidence they will accept that a batteries is defective if:
1)a professional battery load tester with calibration certs (you cannot use one of the 150W capacity units, probably one of the $400 units would be ok, maybe)
2)a video of the entire 24hour long test for the complete full charge and discharge cycle..which MUST be less than 500mb so it meets the aliexpress upload limit (maybe 320x240 video would fit if highly compressed but you would not be able to actually read the displays).
if you cannot meet those requirements, they will offer $20 which the aliexpress dispute team will agree with as you cannot/did not meet the liitokalavaricore store test requirements.
I would recommend anyone buying to avoid them on aliexpress and consider joining one of the group buy threads here on the forums.
sadly I found this forum just AFTER i made my order. The prices are not worth the trouble...
As we are all here to share triumps and warnings...I am sharing this warning (and I bought a replacement cell for my 8S string using one of the group buy threads as well as another 8 cells for my second string).