Hi all,
I bought 16 EVE LF280K cells from Amy Zheng in April 2022. Recently I discovered that at least one cell in my 8S battery had failed. Everything looked fine until the night before, the SOC was 60%. The next morning we opened the fridge and noticed it was dark (off). That’s when we checked the voltage of the battery cells. The 12V fridge was the only load on the 24V LiFePO4 battery via a 24V-to-12V converter. After measuring the voltages of each cell, we disconnected the cells to protect healthier cells. Then we took a video showing the voltage of each cell to send to Amy. The voltages were
2.664V
2.625
1.921
0.660
2.649
2.652
2.660
2.728
3.385 – This last one is from another (healthy) battery.
We were using a BMS, so not sure why the voltage went so low. The BMS manual shows the low voltage protection setting range is 2.7 to 2.9V. This means a user cannot adjust it to 0V by error. The manual says the delay for the protection is 1 to 3 seconds. Perhaps if there was a short circuit within a cell, in 3 seconds the voltage got lower and lower?
Before the purchase, I requested their warranty info, which Amy sent me in a pdf. The warranty details were the same as what you see on their webpage, except they’ve added one more sentence at the end of their web version.
www.docanpower.com
The warranty says, “Warranty period: 3 years (from the date of successful delivery), if the single battery capacity less than 80% initial capacity, take the test pictures or video to us, we will replace it or give satisfied solution.” I hope Amy will keep her promise and provide a free replacement because as far as we know, there is no user error involved here.
I am seeking help in 2 areas:
1) I would like to hear other people’s experiences with the Docan warranty. Please share on this thread.
2) Assuming the lowest voltage cell is dead, how should we try to safely revive the 7 other cells?
Thanks
I bought 16 EVE LF280K cells from Amy Zheng in April 2022. Recently I discovered that at least one cell in my 8S battery had failed. Everything looked fine until the night before, the SOC was 60%. The next morning we opened the fridge and noticed it was dark (off). That’s when we checked the voltage of the battery cells. The 12V fridge was the only load on the 24V LiFePO4 battery via a 24V-to-12V converter. After measuring the voltages of each cell, we disconnected the cells to protect healthier cells. Then we took a video showing the voltage of each cell to send to Amy. The voltages were
2.664V
2.625
1.921
0.660
2.649
2.652
2.660
2.728
3.385 – This last one is from another (healthy) battery.
We were using a BMS, so not sure why the voltage went so low. The BMS manual shows the low voltage protection setting range is 2.7 to 2.9V. This means a user cannot adjust it to 0V by error. The manual says the delay for the protection is 1 to 3 seconds. Perhaps if there was a short circuit within a cell, in 3 seconds the voltage got lower and lower?
Before the purchase, I requested their warranty info, which Amy sent me in a pdf. The warranty details were the same as what you see on their webpage, except they’ve added one more sentence at the end of their web version.
Return & Refund Policy
DIY battery pack must get the cells balanced (same voltage ) before assembly. Later if there happens don't know how to assembled or wrong assembly is not accepted refund. Professionals will detected voltage/resistance/appearance and other issues before every shipment, we can only ensure that the sin
www.docanpower.com
The warranty says, “Warranty period: 3 years (from the date of successful delivery), if the single battery capacity less than 80% initial capacity, take the test pictures or video to us, we will replace it or give satisfied solution.” I hope Amy will keep her promise and provide a free replacement because as far as we know, there is no user error involved here.
I am seeking help in 2 areas:
1) I would like to hear other people’s experiences with the Docan warranty. Please share on this thread.
2) Assuming the lowest voltage cell is dead, how should we try to safely revive the 7 other cells?
Thanks
