Damaged or End Of Life Batteries
Many ONYX 23AH and 41AH batteries are aging out and will soon need to be replaced and disposed of properly. If your battery has reached the end of its life, the ONYX aftermarket battery builders listed here can help you design a custom replacement for your ONYX RCR or CTY2. Remember to approach these services with professionalism and courtesy. For everyday performance and range, Samsung 50S cells are highly recommended. For those seeking higher performance, Molicel P45B and P50B cells are excellent choices.
Stock Batteries
Aftermaket Batteries
Battery Repair
ONYX BATTERY BMS APP
For the ONYX 45Ah battery, use the “Superpower BMS” app, and for the ONYX 41Ah battery, use “Overkill Solar.” While the Xiaoxiang BMS app is excellent, there is no Android version available on the Google Play Store. However, a downloadable version can be found in the community Dropbox. Avoid using the original ONYX BMS for the ONYX 41Ah battery.
ONYX 45AH BATTERY BMS APP
ONYX 41AH BATTERY BMS APP
- ONYX 41AH Overkill Solar BMS App - iOS
- ONYX 41AH Overkill Solar BMS App - Android
- Xiaoxang BMS App - iOS
Cell Group Too High
This battery has locked itself, preventing usage-a safeguard function of the BMS designed to protect both the battery and the user. This includes disabling discharge or charge if necessary. Cell group #5 is showing an unusually high reading of 4.166V, compared to the other 19 cell groups, which average around 3.8V. Such a significant discrepancy is highly unlikely to be accurate, as it is rarely observed under normal conditions.
A cracked solder joint or a detached BMS balance wire is likely causing this false reading. Repairing the battery involves reattaching the balance wire, which requires carefully opening the battery, fixing the connection, and reassembling it securely.
Slightly Unblanced
This battery has a slight imbalance of 0.090V. Ideally, we aim to keep ONYX batteries balanced between 0.002V and 0.050V. While 0.090V isn’t ideal, it’s not critical, and in most cases, this level of imbalance resolves itself over time without any intervention.
Cabalibration Required
The percentage, voltage, and amp-hour readings at the top are inconsistent. At 78.72V, the battery is not at 99% charge, nor does it reflect 30.43Ah out of 41.00Ah accurately. Instead, this voltage corresponds to approximately 75% charge. To resolve this issue, the battery needs a “calibration.” Follow the instructions in the linked post below to recalibrate your ONYX 41Ah battery correctly.
Cell Group To Low
Unfortunately, this issue could be due to a broken balance wire, resulting in no reading for cell group #15 at 1.62V, or it might indicate that cell group #15 contains one or more bad cells. Determining the exact cause requires physically diagnosing the battery by opening it. This is a hit-or-miss situation that typically involves sending the battery in for a full inspection.
If the problem turns out to be a bad cell group, replacing the faulty cells is often not worth it. New cells rarely match the existing ones in discharge and charge behavior, a process known as “sorting” cells, which can lead to ongoing performance issues.
Unbalanced
With a voltage imbalance of 0.418V, this ONYX 41Ah battery is significantly unbalanced by any definition. While there is a slight possibility that this could be due to a balance wire contact issue, the first step should be addressing the imbalance. Follow the instructions in the linked post below to correct the imbalance effectively.
BMS Log Readings
The readings from “battery cycles” down to “single cell undervoltage times” appear normal. However, the “single cell overvoltage times” field indicates that the owner attempted to use regenerative braking while the battery was fully charged. Meanwhile, the “single cell undervoltage times” field suggests they tend to use heavy throttle during operation.
Balancing Fix Process
This battery is undergoing balance correction, but the top amp-hour reading is inaccurate at 36.90Ah with a voltage of 83.68V. In addition to balancing, the battery also requires calibration. Use the links below to follow the steps for balancing and calibrating the battery properly.
Slightly Unbalanced
This ONYX 41Ah battery is currently charging and working to correct a slight imbalance on its own. The screen shows a normal readout with a slightly elevated imbalance of 0.105V. In most cases, no action is required. Charging habits can sometimes lead to minor imbalances, but the battery typically resolves these on its own over time.
Damaged
This battery issue is easy to identify because the bike only powers on when the charger is connected. Look for these warning signs:
- 0.00 of 41.00 Ah (No Bueno)
- Cell Voltage: 3.521V (Anything above 0.300V is high)
- Cell Voltage Difference: 0.051V (Dangerously low balance for group 14)
In most cases, the issue is caused by a broken solder point on a balance lead wire, which should only be repaired by a qualified battery professional. Alternatively, it could be due to one or more bad cells, which requires a physical inspection to diagnose.
Warning! If your battery shows these symptoms, STOP using it immediately. Do not plug in the charger or attempt to activate the discharge port. The BMS is designed to protect the system by disabling the discharge port-do not override this safety feature.
Unable to Balance
If the battery has not balanced after 4 to 8 days, it is likely that the problematic cell group will remain unbalanced for the rest of its lifespan. Additionally, there is a risk that the imbalance will worsen over time, requiring constant monitoring. This worsening imbalance will also impact the battery’s range as it deteriorates further.
Perfect
This is a prime example of a flawlessly performing ONYX 41Ah battery, showcasing ideal temperatures, voltage, percentage, amp-hours, and balanced cell groups. To learn more about the ONYX 41Ah battery and proper year-round storage techniques, check out the posts linked below.
