Credit: Tiếu Ngạo Giang Hồ
ONYX 41AH BMS Settings
Navigate these settings for both ONYX 41Ah battery stock settings and tuned settings configuration for optimal performance, range, and power.
- Note that all temperature settings are in Celsius, not Fahrenheit.
Battery BMS App
Use the Overkill Solar BMS app or the Xiaoxiang BMS app to configure the ONYX 41Ah battery. Download links and instructions for the ONYX 41Ah battery BMS apps can be found below.
Battery and Cycle Capacity
-
Total Battery Capacity: Set this field to the full capacity of the battery in milliamp-hours (mAh). For a 41Ah battery, this value would be 41000.
-
Total Cycle Capacity: Set this field to 80% of the total capacity. For a 41Ah battery, this value would be 32800.
BMS Stock Configuration
Capacity Configuration
| Field | Value |
|---|---|
| Number of Cell | 20 |
| Total Battery Capacity | 41000 |
| Total Cycle Capacity | 32800 |
| Cell Full Voltage | 4150 |
| Cell Minimum Voltage | 3000 |
| Cell Self Discharge | 0.2 |
| Cell 100% Cap. Voltage | 4150 |
| Cell 90% Cap. Voltage | 4075 |
| Cell 80% Cap. Voltage | 4000 |
| Cell 70% Cap. Voltage | 3900 |
| Cell 60% Cap. Voltage | 3800 |
| Cell 50% Cap. Voltage | 3700 |
| Cell 40% Cap. Voltage | 3600 |
| Cell 30% Cap. Voltage | 3450 |
| Cell 20% Cap. Voltage | 3300 |
| Cell 10% Cap. Voltage | 3150 |
Balancer Configuration
| Field | Value |
|---|---|
| Start Voltage | 4000 |
| Delta to Balance | 15 |
| Balancer Enabled (On) | Green |
| Bal. Only When Charging (On) | Green |
Function Configuration
The field switch “Display Celsius” can be changed according to you preference.
| Field | Value |
|---|---|
| SW Switch Circuit Enabled (Off) | Gray |
| Display Celsius (Off) | Gray |
Protections
| Field | Trigger | Release | Delay |
|---|---|---|---|
| Cell Over Voltage | 4250 | 4150 | |
| Cell Under Voltage | 2700 | 3000 | |
| Batt Over Volt. | 85000 | 83000 | |
| Batt Under Volt. | 54000 | 60000 | |
| Charge Over Curr. | 70000 | 32 | |
| Discharge Over Curr. (80 Amp BMS) | 90000 | 32 | |
| Discharge Over Curr. (100 Amp BMS) | 110000 | 32 | |
| Charge Over Temp | 65 | 55 | 2 |
| Charge Under Temp | -5 | 0 | 2 |
| Discharge Over Temp | 70 | 60 | 2 |
| Discharge Under Temp | -10 | 0 | 2 |
NTC Enable
NTC refers to the temperature sensors located on the BMS board and around the battery. Some batteries only utilize NTC1, NTC2, and NTC4 sensors.
| Field | Box |
|---|---|
| NTC1 | Checked |
| NTC2 | Checked |
| NTC3 | Checked |
| NTC4 | Checked |
| NTC5 | Not Checked |
| NTC6 | Not Checked |
| NTC7 | Not Checked |
| NTC8 | Not Checked |
Level 2 Protections
| Field | Trigger | Delay |
|---|---|---|
| Level 2 Overcurrent | 720 | 320 |
| Level 2 Overvoltage | 4400 | 8 |
| Level 2 Undervoltage | 2500 | 8 |
Level 3 Protections
| Field | Trigger | Delay | Reset |
|---|---|---|---|
| Level 3 Overcurrent (Short Circuit) | 2000 | 400 | 5 |
BMS Tuned Configuration
Capacity Configuration
| Field | Value |
|---|---|
| Number of Cell | 20 |
| Total Battery Capacity | 41000 |
| Total Cycle Capacity | 32800 |
| Cell Full Voltage | 4150 |
| Cell Minimum Voltage | 2700 |
| Cell Self Discharge | 0.2 |
| Cell 100% Cap. Voltage | 4150 |
| Cell 90% Cap. Voltage | 4050 |
| Cell 80% Cap. Voltage | 3950 |
| Cell 70% Cap. Voltage | 3900 |
| Cell 60% Cap. Voltage | 3700 |
| Cell 50% Cap. Voltage | 3600 |
| Cell 40% Cap. Voltage | 3400 |
| Cell 30% Cap. Voltage | 3300 |
| Cell 20% Cap. Voltage | 3200 |
| Cell 10% Cap. Voltage | 3000 |
Balancer Configuration
| Field | Value |
|---|---|
| Start Voltage | 3800 |
| Delta to Balance | 10 |
| Balancer Enabled (On) | Green |
| Bal. Only When Charging (On) | Green |
Function Configuration
The field switch “Display Celsius” can be changed according to you preference.
| Field | Value |
|---|---|
| SW Switch Circuit Enabled (Off) | Gray |
| Display Celsius (Off) | Gray |
Protections
| Field | Trigger | Release | Delay |
|---|---|---|---|
| Cell Over Voltage | 4250 | 4150 | |
| Cell Under Voltage | 2600 | 2800 | |
| Batt Over Volt. | 85000 | 83000 | |
| Batt Under Volt. | 54000 | 60000 | |
| Charge Over Curr. | 70000 | 32 | |
| Discharge Over Curr. (80 Amp BMS) | 90000 | 32 | |
| Discharge Over Curr. (100 Amp BMS) | 110000 | 32 | |
| Charge Over Temp | 65 | 55 | 2 |
| Charge Under Temp | -5 | 0 | 2 |
| Discharge Over Temp | 70 | 60 | 2 |
| Discharge Under Temp | -10 | 0 | 2 |
NTC Enable
NTC refers to the temperature sensors located on the BMS board and around the battery. Some batteries only utilize NTC1, NTC2, and NTC4 sensors.
| Field | Box |
|---|---|
| NTC1 | Checked |
| NTC2 | Checked |
| NTC3 | Checked |
| NTC4 | Checked |
| NTC5 | Not Checked |
| NTC6 | Not Checked |
| NTC7 | Not Checked |
| NTC8 | Not Checked |
Level 2 Protections
| Field | Trigger | Delay |
|---|---|---|
| Level 2 Overcurrent | 720 | 320 |
| Level 2 Overvoltage | 4400 | 8 |
| Level 2 Undervoltage | 2500 | 8 |
Level 3 Protections
| Field | Trigger | Delay | Reset |
|---|---|---|---|
| Level 3 Overcurrent (Short Circuit) | 2000 | 400 | 5 |
Calibrated Capacity
This screenshot shows an ONYX 41AH HD battery calibrated to around 60 volts, with an additional 5Ah of capacity remaining. This extra capacity extends the range by 4 to 10 miles, depending on throttle use. For full-throttle riding, the added 5Ah provides approximately 3 extra miles of high-speed performance at the top of the charge.
Tuned BMS Resting Voltage
When optimizing the BMS for enhanced performance and range, it’s essential to consider the significance of resting voltage levels to maintain battery health and longevity.
ONYX 41AH EK Warning
I do not recommend these tuned settings for the EK version of the ONYX 41Ah. When connecting to an ONYX 41Ah through any BMS app, the first two letters will indicate its version: either HD or EK. In 2024, it was revealed that all ONYX 41Ah EK revision batteries sold from late 2023 to early 2024 were actually 38Ah in capacity and did not include cell protectors.
Outlet Timer with Remote Control
While you can leave your charger plugged in overnight, it’s always a good idea to use an outlet timer-just in case you forget!