The Sur-Ron Ultra Bee is a fantastic machine, but it suffers from a major flaw in its original configuration: its battery is electronically limited. The manufacturer's BMS (Battery Management System) restricts power to 12.5kW and cuts off power far too early (at 3.5V per cell), leaving a huge amount of unused energy.
Until now, the only solution for true power (30kW) was to buy a custom battery for over €2500. But that was before. With Antonin from Ampérion, we have a much smarter solution to present to you.
1. The "Unlocker" BMS Kit: The Affordable Revolution
Why change a battery that contains excellent cells (Farasis P53B)? The problem isn't the chemistry; it's the software. Our Performance BMS Kit replaces your battery's brain to:
- Unleash power: The battery can finally deliver up to 30kW peak (requires a Torp, EBMX, or VTB type controller).
- Increase range (+25%): By lowering the cut-off threshold to 3.0V (a safe and industry-standard value), you recover all the energy Sur-Ron was "hiding" from you.
- Enable fast charging: The new charging port supports much higher currents.
2. The "Saddle-Boost" Extension: Unlimited Enduro
For those who want to ride for a long time without stress, we have developed a 720Wh extension that discreetly fits in the compartment under the saddle.
Connected in parallel with the main (unlocked) battery, it offers a monstrous total capacity. No more fear of running out of power in the middle of the woods. In addition, by distributing the effort across more cells, the battery heats up less and lasts longer.
See the Saddle-Boost Extension Pack here
3. Installation: Is it difficult?
As you'll see in the video above, installation requires precision but remains accessible. No complex soldering is needed.
⚠️ Safety warning: Working on a 72V battery requires strict precautions (no jewelry, insulated tools, safety glasses). If you don't feel comfortable, we offer an installation service: you send us your battery, and we'll take care of everything!
Conclusion: The Best Alternative to Custom Batteries
For a budget significantly lower than a complete battery, this BMS + Extension combo literally transforms the Ultra Bee. You get the power of a dirt bike and the range of an adventure bike, all while retaining the original lightweight chassis.
Need to charge fast? Discover our Adjustable Super Charger, capable of delivering up to 50A for lightning-fast recharging!