This page is part of the ONYX Battery Guide
This guide is a technical reference for the 72V ONYX 45Ah battery used on the RCR platform.
The 45Ah pack represents ONYX’s modern battery architecture, with improvements in connector design, BMS capability, current handling, thermal stability, and long-term durability.
The focus here is on how the battery operates, how to use it correctly, and how it behaves under real-world conditions.
ONYX 45Ah 72V Platform Overview
The ONYX 45Ah battery operates on the standard 72V system used across the RCR platform.
- Nominal voltage: 72V
- Full charge: 84V
- Mid pack: ~72V
- Empty: ~60V
The pack uses lithium-ion NMC/NCA cells and integrates a high-current smart BMS with Bluetooth monitoring.
Battery Management System (BMS)
The 45Ah pack uses a SuperPower smart BMS designed for high discharge current and automatic safety control.
The BMS is responsible for:
- over-current protection
- short-circuit protection
- over-temperature protection
- cell balancing
- state of charge tracking
- state of health estimation
- automatic discharge port management
Typical continuous current capability:
180A+ (BMS-limited)
ONYX 45Ah 72V BMS App
What the App Shows
- pack voltage
- individual cell group voltages
- cell voltage delta
- battery temperature
- current (charge and discharge)
- State of Health (SOH)
- error history
These values provide visibility into how the battery is operating.
ONYX 45Ah 72V Cell Balance
| Delta | Range |
|---|---|
| 0.01–0.05 V | low variation |
| 0.05–0.10 V | moderate variation |
| 0.10–0.15 V | elevated variation |
| 0.15–0.30 V | high variation |
| 0.30 V+ | very high variation |
Delta represents the difference between the highest and lowest cell groups.
ONYX 45Ah 72V Connector
The 45Ah battery uses a QS8 anti-spark connector.
- automatic discharge control
- no app configuration required
- no arcing on connection
- rated for high continuous current
ONYX 45Ah 72V Connecting the Charger
- Plug the charger into the wall first
- Then connect the XLR to the battery
ONYX 45Ah 72V Charging Times
| Charger | 0 → 100% | 50 → 100% |
|---|---|---|
| 5A | ~11.5 h | ~8.2 h |
| 10A | ~5.8 h | ~4.0 h |
Charging to 83–83.5V instead of 84V reduces long-term stress with minimal range impact.
ONYX 45Ah 72V Reading Battery Level
| Voltage | State |
|---|---|
| 84 V | Full |
| 72 V | ~50% |
| 60 V | Empty |
ONYX 45Ah 72V Temperature Guidelines
- discharge maximum: 140°F / 60°C
- charge recommended: 40°F-105°F (4°C-40.5°C)
- charge limits: 32°F-113°F (0°C-45°C)
- rest 30–60 minutes after aggressive riding
ONYX 45Ah 72V Best Charging Practice
| Use Case | Voltage |
|---|---|
| Daily riding | 78–81 V |
| Long storage | ~74 V |
| Maximum range | 83–84 V |
ONYX 45Ah 72V Charge Cycle Multipliers
| Charge Level | Life |
|---|---|
| 84 V | 1× |
| 83 V | 1.5× |
| 82 V | 2× |
| 81 V | 3× |
| 80 V | 4× |
ONYX 45Ah 72V Voltage Sag
| Sag | Range |
|---|---|
| 3–8 V | lower sag range |
| ~10 V | elevated sag |
| 10–15 V | high sag |
| 15 V+ | very high sag |
Sag varies based on load, temperature, and battery condition.
ONYX 45Ah 72V Battery and Cell Voltage Chart
| Battery V | Cell V | Description |
|---|---|---|
| 90V | 4.50V | Thermal runaway risk |
| 88V | 4.40V | Thermal runaway risk |
| 85V | 4.25V | Rapid degradation |
| 84V | 4.20V | True 100% |
| 83V | 4.15V | Stock “100%” |
| 80V | 4.00V | ~80% |
| 74V | 3.70V | Storage level |
| 72.5V | 3.63V | ~50% |
| 66V | 3.30V | ~25% |
| 60V | 3.00V | Empty |
| 50V | 2.50V | Minimum |
| <50V | <2.50V | Damage occurs |
Battery Diagnostics
For diagnosing imbalance, voltage sag issues, BMS behavior, or determining whether the battery requires repair:
Final Notes
The ONYX 45Ah battery is designed for higher current capability and improved stability compared to earlier ONYX batteries.
To maintain performance and lifespan:
- stay within safe temperature limits
- use appropriate charge levels for daily riding
- monitor battery behavior through the BMS app
- avoid unnecessary stress from excessive heat or current
Understanding how the battery behaves under load and during charging is key to long-term reliability.