Hi
I think I need your help.
As discussed in this thread: https://diysolarforum.com/threads/looking-for-272ah-or-280ah-cells.20185/
I purchased a 300ah 12v Lifepo4 battery bank from China via AliExpress: https://www.aliexpress.com/item/1005002752049532.html?
The battery finally turned up after 3 months, and I performed a capacity test, and it came out at about 81ah compared to the advertised 300ah. Quite a difference.
However, as I'm sure some of you will have anticipated the seller is not accepting this, and AliExpress have not accepted my evidence that the battery is not as advertised.
I posted this photo of the discharge test, just before it ended, and initially the seller argued that the battery can go down to 10v, so my test wasn't correct,
and now AliExpress are saying that the meter I used (which they sell) isn't valid to do such a test. I think I'm screwed here. Any thoughts?
My photo below.
I think I need your help.
As discussed in this thread: https://diysolarforum.com/threads/looking-for-272ah-or-280ah-cells.20185/
I purchased a 300ah 12v Lifepo4 battery bank from China via AliExpress: https://www.aliexpress.com/item/1005002752049532.html?
The battery finally turned up after 3 months, and I performed a capacity test, and it came out at about 81ah compared to the advertised 300ah. Quite a difference.
However, as I'm sure some of you will have anticipated the seller is not accepting this, and AliExpress have not accepted my evidence that the battery is not as advertised.
I posted this photo of the discharge test, just before it ended, and initially the seller argued that the battery can go down to 10v, so my test wasn't correct,
The minimum voltage of lithium iron phosphate is 2.5X4=10V, and the full-load voltage is 3.65X4=14.6V. The measurement is wrong. The measured voltage provided by the buyer is 10.98V, which is obviously wrong To measure the capacity of the battery, the calculation must be started at the lowest voltage of 10V, and the saturation voltage is measured to 14.6V. .
and now AliExpress are saying that the meter I used (which they sell) isn't valid to do such a test. I think I'm screwed here. Any thoughts?
My photo below.