Symbioquine
Solar Enthusiast
- Joined
- Jul 6, 2021
- Messages
- 429
I have two (in parallel) DIY 8S LF280K batteries with Overkill BMS' that I built this fall. (Charged cells as a pack with BMS, then top-balanced individual cells to 3.645v and <0.5a.)
Recently, I've been observing some interesting behavior with the cell voltages that I'm hoping someone here can help explain.
What I'm seeing is that when one of the batteries starts to get close to full, cell #5 - and to a lesser degree cell #6 - doesn't follow the same voltage curve as the other cells. Instead of approaching 1/8th of the charging voltage, those cells exhibit a drop in voltage while the other cells keep going up.
Recently, I've been observing some interesting behavior with the cell voltages that I'm hoping someone here can help explain.
What I'm seeing is that when one of the batteries starts to get close to full, cell #5 - and to a lesser degree cell #6 - doesn't follow the same voltage curve as the other cells. Instead of approaching 1/8th of the charging voltage, those cells exhibit a drop in voltage while the other cells keep going up.
- Is this something to worry about? (Overall, I'm fairly pleased with the performance of the batteries, but I'm nervous that moving into spring/summer I'll be operating closer to full more and more.)
- Could this be explained by a bad terminal connection that I just need to tighten/clean? Something else?