JustAGuy101
New Member
- Joined
- Dec 14, 2020
- Messages
- 14
Well, I think I've read all the related threads about this topic and am encountering a condition I don't understand.
I have 4 new 206 AH LiFePo4 Cells which arrived at between 3.265 and 3.269 volts each. I believe this is pretty standard and
represents a (roughly) 50% state of charge.
I have an overkill BMS with bluetooth module. I have watched Will's initial top balancing video and downloaded and read, several times,
the PDF file that explains how to charge and top balance.
First, I attempted to charge each cell individually , with the power supply as recommended by Will in his video but never could get any one cell to get above about 3.30V
I then assembled the cells into a conventional 4s, 12v battery with the BMS and attempted to use my 10A PS to charge/balance the cells that way (at 14.5V). According to the app that comes with the BMS, the battery reached 100% capacity with each cell only reaching a very consistent 3.349V on all 4 Cells. I verified this with two different multimeters.
I am currently attempting to top balance all 4 cells by connecting them in parallel and charging at 3.6V. I followed the instructions in Will's video as well as the instructions in the PDF file for balancing in parallel. I set the voltage on the PS to 3.6 and Amperage to max with the parallel pack completely disconnected from the PS. So far so good. Voltage on PS reads 3.6 and the CV light is on. However, when I connect the PS to the pack, the voltage display on the PS goes to 3.5V, Amps goes to 10.1A and the PS switches to CC. Is this OK? Will the PS switch back to CV at some point as charging continues? What is happening here?
Thanks in advance.
I have 4 new 206 AH LiFePo4 Cells which arrived at between 3.265 and 3.269 volts each. I believe this is pretty standard and
represents a (roughly) 50% state of charge.
I have an overkill BMS with bluetooth module. I have watched Will's initial top balancing video and downloaded and read, several times,
the PDF file that explains how to charge and top balance.
First, I attempted to charge each cell individually , with the power supply as recommended by Will in his video but never could get any one cell to get above about 3.30V
I then assembled the cells into a conventional 4s, 12v battery with the BMS and attempted to use my 10A PS to charge/balance the cells that way (at 14.5V). According to the app that comes with the BMS, the battery reached 100% capacity with each cell only reaching a very consistent 3.349V on all 4 Cells. I verified this with two different multimeters.
I am currently attempting to top balance all 4 cells by connecting them in parallel and charging at 3.6V. I followed the instructions in Will's video as well as the instructions in the PDF file for balancing in parallel. I set the voltage on the PS to 3.6 and Amperage to max with the parallel pack completely disconnected from the PS. So far so good. Voltage on PS reads 3.6 and the CV light is on. However, when I connect the PS to the pack, the voltage display on the PS goes to 3.5V, Amps goes to 10.1A and the PS switches to CC. Is this OK? Will the PS switch back to CV at some point as charging continues? What is happening here?
Thanks in advance.