lithium polymer battery pack
Posted: Tue Feb 04, 2025 11:52 am
Hello there,
I have recently purchased a Bonka 22.2V 1800mAh 120C 6S FPV U2 Series Lithium Polymer Battery Pack.
After charging the battery using a balanced charger and performing around 2 full cycles, I observed an imbalance in the individual cell voltages after a slight discharge. This was confirmed using two different voltage checkers to ensure accuracy. While most cells measure around 4.21-4.22V, one cell consistently measures lower (e.g., 4.14V after charging, and the imbalance grows after even slight usage).
I have not used the battery yet, and it has been handled carefully according to the manufacturer's recommendations.
I conducted a full discharge and balance charge cycle on the LiPo battery. Here are the observed results:
• After Discharge (~3.7V per cell):
3.71V, 3.69V, 3.73V, 3.72V, 3.72V, 3.74V (Total: 22.3V)
• After Full Balanced Charge (~4.2V per cell):
4.20V, 4.21V, 4.22V, 4.21V, 4.20V, 4.17V (Total: 25.2V)
The voltage difference remains within 0.05V, which I understand is generally acceptable. However, I wanted to confirm:
Could this imbalance worsen over time and impact long-term battery performance? Do new battery packs exhibit such V differences?
As I have been using LiPos for years, I did notice a V difference after using batteries over a period of time, but not when they were new.
After a few charge and discharge cycles, I have noticed:
Cell 6 consistently holds a higher voltage than others after balancing, which did not happen with my previous LiPos from Robu and other manufacturers, especially when they were new.
Voltage spread between cells is slightly inconsistent, which raises concerns about long-term reliability unlike my other LiPos.
Is this a common experience for others as well? Your guidance would be appreciated.
I have recently purchased a Bonka 22.2V 1800mAh 120C 6S FPV U2 Series Lithium Polymer Battery Pack.
After charging the battery using a balanced charger and performing around 2 full cycles, I observed an imbalance in the individual cell voltages after a slight discharge. This was confirmed using two different voltage checkers to ensure accuracy. While most cells measure around 4.21-4.22V, one cell consistently measures lower (e.g., 4.14V after charging, and the imbalance grows after even slight usage).
I have not used the battery yet, and it has been handled carefully according to the manufacturer's recommendations.
I conducted a full discharge and balance charge cycle on the LiPo battery. Here are the observed results:
• After Discharge (~3.7V per cell):
3.71V, 3.69V, 3.73V, 3.72V, 3.72V, 3.74V (Total: 22.3V)
• After Full Balanced Charge (~4.2V per cell):
4.20V, 4.21V, 4.22V, 4.21V, 4.20V, 4.17V (Total: 25.2V)
The voltage difference remains within 0.05V, which I understand is generally acceptable. However, I wanted to confirm:
Could this imbalance worsen over time and impact long-term battery performance? Do new battery packs exhibit such V differences?
As I have been using LiPos for years, I did notice a V difference after using batteries over a period of time, but not when they were new.
After a few charge and discharge cycles, I have noticed:
Cell 6 consistently holds a higher voltage than others after balancing, which did not happen with my previous LiPos from Robu and other manufacturers, especially when they were new.
Voltage spread between cells is slightly inconsistent, which raises concerns about long-term reliability unlike my other LiPos.
Is this a common experience for others as well? Your guidance would be appreciated.