This guide is a detailed technical reference for the 72V ONYX 45Ah battery used on the RCR platform.
The 45Ah pack represents ONYX’s modern battery architecture, with major improvements in connector design, BMS capability, current handling, thermal stability, and long-term durability.
It is built to support both stock and high-output controllers while offering wider safety margins and far simpler day-to-day operation than earlier generations.
The sections below move from core fundamentals into real-world behavior, tuning considerations, and long-term ownership.
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 high-quality lithium-ion NMC/NCA cells (18650 or 21700 class) and integrates a high-current smart BMS with Bluetooth monitoring.
Battery Management System (BMS)
The 45Ah pack uses a modern 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 (balance)
- Battery temperature
- Current (charge and discharge)
- State of Health (SOH)
- Error history
ONYX 45Ah 72V Cell Balance
| Delta | Meaning |
|---|---|
| 0.01–0.05 V | Excellent |
| 0.05–0.10 V | Normal |
| 0.10–0.15 V | Acceptable |
| 0.15–0.30 V | Warning |
| 0.30 V+ | Severe |
High imbalance causes reduced capacity, early cutoffs, increased heat, and accelerated aging.
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 very 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 significantly improves lifespan with minimal range loss.
ONYX 45Ah 72V Reading Battery Level
| Voltage | State |
|---|---|
| 84 V | Full |
| 72 V | ~50% |
| 60 V | Empty |
ONYX 45Ah 72V Temperature Guidelines
- Ride below 60°C / 140°F
- Charge below 40°C / 104°F
- 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 | Condition |
|---|---|
| 3–8 V | Good |
| ~10 V | Poor |
| 10–15 V | Risky |
| 15 V+ | High risk |
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 |
ONYX 45Ah 72V Final Notes
The 72V ONYX 45Ah battery is the most capable production battery ONYX has released for the RCR platform.
It combines:
- High sustained current capability
- Stable thermal performance
- Strong long-term cell balancing
- Safe, high-current connectors
- Modern, well-supported BMS software
With disciplined charging habits and reasonable temperature management, it can deliver 25,000–35,000 miles of dependable service and remain useful well beyond that for lower-power riding.