Surron Ultra Bee 72V Molicel Battery - 63Ah / 67.5Ah / 75Ah
Built as a drop-in replacement for the Surron Ultra Bee, this battery matches the stock pack's size and fits with no battery-lid modification required, while delivering over double the power output and remaining fully compatible with the stock controller. All batteries include a new bike power harness built with a high-current fuse for protection, plus all parts needed for the communication cable, giving full compatibility with both stock and aftermarket controllers.
Cell Options
Unlike the stock pouch cells, which heat up and lose performance under load, this battery uses genuine high-performance Molicel cells built for high current output, improved efficiency, and long-term durability — capable of delivering their full rated current while maintaining a long cycle life, unlike lower-grade cells such as the 50S.
- Molicel P42A – The proven original. Delivers excellent power output, reliability, and long cycle life.
- Molicel P45B – An upgraded successor to the P42A, offering higher capacity, lower internal resistance, improved power delivery, and even better thermal performance while maintaining excellent longevity.
- Molicel P50B – Molicel's flagship cell. It provides the highest capacity, the longest range, exceptional power output, and dramatically improved longevity, with over 1000+ charge cycles. Approximately double the cycle life of previous.
Expect increased range, stronger throttle response, and more consistent power at lower charge levels — all while generating less heat and avoiding the rapid performance degradation seen in weaker cells.
📄 View the Install Guide (PDF)
- 72V Battery
- 15A Fast Charger
- QS10 Bike Power Harness
Battery Options Comparison
| Spec | Molicel P42A 4200mAh |
Molicel P45B 4500mAh |
Molicel P50B 5000mAh |
|---|---|---|---|
| Configuration | 20s15p | 20s15p | 20s15p |
| Max Voltage | 84V | 84V | 84V |
| Capacity | 4,536Wh / 63Ah | 4,860Wh / 67.5Ah | 5,400Wh / 75Ah |
| Continuous Power | 450A / 32.4kW | 525A / 37.8kW | 675A / 48.6kW |
| Max Power | 675A / 48.6kW | 675A / 48.6kW | 900A / 64.8kW |
| Discharge Connector | QS10 | QS10 | QS10 |
| Max Charge Current | 20A | 20A | 20A |
- Metal enclosure with a water-resistant, durable build.
- Compatible with the stock controller.
- Standard XT60 charge port on the pack, plus a custom XT90 port mounted in place of the USB port for a cleaner, more accessible charging solution.
- Battery monitor screen installed on the top lid that displays battery percentage, voltage, and cell temperature.
- Discharge is BMS-bypassed for full, uninterrupted power. The BMS handles charging only — click here to learn more.
- Smart BMS with Bluetooth monitoring.
Note: The dashboard will no longer display battery percentage. Remaining power can be monitored via your controller app, the Bluetooth BMS app, or the built-in screen on the battery lid.
Dimensions:
| Height: | 13.25" (336mm) |
| Width: | 7" (177mm) |
| Length: | 8.75" (222mm) |
| Weight: | 54.8lbs (24.8kg) |
- iOS: Xiaoxiang BMS
- Android: Overkill Solar
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 efficiency, performance, and cost for your build.
| Cell Model | Key Feature | Best For |
|---|---|---|
| P42A (4.2Ah) | High Power / Lower Cost | Great for performance on a budget, strong output, and cost-focused builds. |
| P45B (4.5Ah) | More Capacity / Low Resistance | The ideal middle ground: lower voltage sag, cooler operation, and improved efficiency. |
| P50B (5.0Ah) | Maximum Capacity / Best Efficiency | Premium performance: highest capacity, minimal voltage drop, and lowest operating temperatures. |
