Surron Ultra Bee 72V Battery (20s)
Drop-in replacement battery
Designed to match the stock Ultra Bee battery size, this pack works with the stock controller and includes a new power harness built with a reliable high-current fuse for added protection.
Upgraded cell performance
Unlike the pouch cells in the stock battery, which heat up under load, this battery uses high-performance Molicel cells for greater efficiency and durability, outperforming most other cells. Expect increased range, more consistent power at lower charge levels, and reduced heat under normal riding conditions.
Note: The dashboard battery percentage will not display with this battery; remaining power can be monitored via the Bluetooth BMS app or the built-in screen on the top lid.
- Battery
- Charger
- QS10 Bike Power Harness
63Ah Specs:
| Cell: | Molicel P42A 4200mAh |
| Configuration: | 20s15p |
| Max Voltage: | 84.0V |
| Capacity: | 4,536Wh / 63Ah |
| Power Connector: | QS10 | 4AWG |
| Max Power: | 630A | 45kW |
| Max Charge Current: | 20A |
67.5Ah Specs:
| Cell: | Molicel P45B 4500mAh |
| Configuration: | 20s15p |
| Max Voltage: | 84.0V |
| Capacity: | 4,860Wh / 67.5Ah |
| Power Connector: | QS10 | 4AWG |
| Max Power: | 675A | 48kW |
| Max Charge Current: | 20A |
75Ah Specs:
| Cell: | Molicel P50B 5000mAh |
| Configuration: | 20s15p |
| Max Voltage: | 84.0V |
| Capacity: | 5,400Wh / 75Ah |
| Power Connector: | QS10 | 4AWG |
| Max Power: | 750A | 54kW |
| Max Charge Current: | 20A |
- Battery monitor screen installed on the top lid that displays battery percentage, voltage, and cell temperature.
- Discharge is BMS bypassed for full, uninterrupted power (BMS is for charge only).
- Smart BMS with Bluetooth monitoring.
- LP20 charge port, same high quality connection as the stock battery
BMS App:
- iOS: Xiaoxiang BMS
- Android: Overkill Solar
Built and shipped from Canada 🍁
Cell Comparison
All Molicel 21700 cells offer incredible power, but they are optimized for different priorities. Use this guide to select the best balance of range, efficiency, and cost for your build.
| Cell Model | Key Feature | Best For | Range Estimate (km) |
|---|---|---|---|
| P42A (4.2Ah) | High Power / Lower Cost | Great for performance on a budget, strong output, and cost-focused builds. | 71-90km (60-75km) |
| P45B (4.5Ah) | More Range / Low Resistance | The ideal middle ground: lower voltage sag, cooler operation, and improved efficiency. | 76-98km (63-80km) |
| P50B (5.0Ah) | Maximum Range / Best Efficiency | Premium performance: maximum range, minimal voltage drop, and lowest temps. | 85-109km (70-90km) |