This reference describes recorded battery temperature and controller-current limits for ONYX systems. Identify the battery and controller before applying a limit; stock observations, aging-pack guidance, and modified settings are different contexts.
Current-Limit Context
The stock-current observations above and the 23Ah ~70A reference are historical descriptions, not targets for aged packs or permission to apply SICKO settings. The model-specific 23Ah battery article and 41Ah battery article describe aging/load limits. The identified Kelly stock export records Bat Current Limit = 55, while the earlier general stock observation above says 50A. Those records describe different contexts and must not be merged into an assumed universal factory setting.
ONYX Battery Safety
Monitor battery temperature using the BMS app during high load operation. 120°F functions as the practical stress threshold. At 140°F, the BMS will disable discharge until the battery cools to about 135°F.
Sustained operation near cutoff temperatures increases internal stress and accelerates degradation.
Fardriver Controller Safety
Do not configure a Fardriver controller to exceed 100A when using the ONYX 41Ah battery.
At 200A, current demand exceeds the battery’s safe discharge capability, causing rapid heat buildup. Under high load conditions such as hill climbs or aggressive throttle input temperature can rise faster than the BMS can respond, increasing the risk of thermal shutdown or damage.
Stock Controller Safety
From 2018-2024, stock ONYX controller settings were limited to 50A, within safe operating limits for both 23Ah and 41Ah batteries.
Sicko Mode at 100A:
- Exceeds the 23Ah battery’s ~70A limit, accelerating wear
- Remains within functional range of the 41Ah battery, but increases long-term stress
While the BMS regulates temperature, repeated high-current use contributes to gradual capacity loss.
Battery Temperature
Battery temperature across ONYX battery configurations should follow one consistent standard.
Discharge Temperature
Maintain discharge temperatures below 120°F (49°C) when possible.
The trigger value defines when the BMS disables discharge due to temperature rise.
The release value defines when normal discharge resumes.
Heat may continue increasing after load is removed due to internal thermal retention, especially in high ambient conditions.
| Battery | Trigger | Release |
|---|---|---|
| ONYX 45AH | 140°F | 135°F |
| ONYX 41AH | 140°F | 135°F |
| ONYX 23AH | 140°F | 135°F |
| ONYX CTY2 23AH | 140°F | 135°F |
| AMORGE | 140°F | 135°F |
Charge Temperature
Recommended charging temperature is 40°F-105°F (4°C-40.5°C).
Absolute charging limits are 32°F-113°F (0°C-45°C).
Avoid charging immediately after heavy use. For example, charging at 10A while internal temperature is 140°F can further elevate thermal stress. Allow the battery to cool into the recommended charging range before charging.
Battery Enclosures and UL Certification
A protective external enclosure is a mechanical design consideration. A metal case alone does not establish compliance or certification to a UL battery standard; confirm the applicable standard and complete battery certification with the manufacturer. See UL Solutions product-certification guidance.
A proper metal case:
- Protects against puncture and deformation
- Maintains structural integrity under load
- Reduces risk from external impact
- Provides safe handling and transport
Batteries without rigid enclosures are more susceptible to physical damage and failure.
ONYX 45AH Battery Safety
ONYX Motors equips the 45Ah battery with a reinforced external metal enclosure designed for structural protection and safe operation.
Design updates include:
- Capacity increase from 41Ah -> 45Ah
- Discharge capability increase from 100A -> 180A
- Improved internal and external construction
These changes improve both performance and durability while maintaining safety through enclosure design and BMS integration.
Safer Aftermarket Batteries
Aftermarket battery development within the ONYX ecosystem has focused on improving:
- Continuous discharge capability
- Thermal performance
- Structural integrity
- Overall safety margins
Common design improvements include:
- Higher gauge wiring
- Thicker copper and busbars
- Advanced BMS systems
- Cell spacing and thermal management materials
- Reinforced external metal enclosures
Recognized Safe Aftermarket Batteries
- AMORGE Batteries
- NAB Battery Systems
Outlet Timer with Remote Control
Using an outlet timer adds a layer of protection by limiting unattended charging duration. While overnight charging is generally supported, a timer reduces the risk of extended charging due to user oversight.
Storage & Security
Best practice:
- Store indoors when possible
- Use a waterproof cover outdoors
- Remove the battery during long storage
- Avoid extreme temperatures