The 72V 66.5Ah SurRon battery is a high-capacity traction pack built for the Sur-Ron Light Bee and Light Bee X electric dirt bikes. It delivers 72V nominal voltage, 66.5 Ah of usable capacity and 15 kW of instantaneous peak power. Every cell group is joined with genuine copper busbars rather than nickel strips.
This pack works exclusively with upgraded controllers. Compatible units include the BAC4000, BAC8000, Torp TC500, EBMX X9000 and KO controllers. Other currently popular aftermarket SurRon controllers are also supported. Connecting this battery to the original factory SurRon controller is strictly prohibited.
The pack is built for riders who have already completed SurRon power upgrades. With this battery, a Light Bee gains substantially longer range and up to three times more power. Recommended continuous motor output sits at 11 kW.
Key Benefits
- Genuine copper busbars – cells are joined with solid copper plates instead of the nickel strips most competitors use.
- Lower cell imbalance – better contact between cells holds voltage across every group more evenly.
- Cooler operating temperature – reduced resistance means less heat build-up, so the pack lasts longer.
- Samsung cells – the entire pack is formed from Samsung-manufactured cells.
- Metal enclosure – a solid metal housing shields the pack from external impact damage.
- Integrated temperature sensors – dedicated hardware prevents the battery from overheating.
- Temperature-based charge protection – the system blocks charging when temperatures are too low or too high.
- Bluetooth app monitoring – track pack status, per-group voltage and temperature from your phone.
Who Is This Battery For?
This 72V 66.5Ah pack is designed for the Sur-Ron Light Bee and the Sur-Ron Light Bee X. Both models accept the pack once an upgraded controller is fitted. The stock factory controller is not supported under any circumstances.
Output is matched to SurRon motors running BAC4000, BAC8000, Torp TC500, EBMX X9000 and KO controllers. Riders using other current aftermarket SurRon controllers will also find the pack suitable. Therefore, confirm your controller before ordering.
The battery suits riders who want longer off-road range and considerably more power. Furthermore, it fits owners who have already invested in SurRon performance upgrades and want to unlock the motor’s full potential.
Technical Specifications
| Nominal voltage | 72 V |
| Maximum voltage | 84 V |
| Minimum voltage | 60 V |
| Capacity | 66.5 Ah |
| Instantaneous peak power | 15,000 W (15 kW) |
| Recommended max motor power | 11,000 W (11 kW) |
| Cell manufacturer | Samsung |
| Cell interconnection | Genuine copper busbars |
| Housing | Solid metal enclosure |
| Temperature control | Integrated temperature sensors |
| Monitoring | App: cell group voltage and temperature |
| Compatible controllers | BAC4000, BAC8000, Torp TC500, EBMX X9000, KO |
| Compatible models | Sur-Ron Light Bee, Light Bee X |
| Required accessory | Seat extender |
| Production | Built to individual order |
Installation Requirements
Because of the pack’s dimensions, a seat extender is mandatory for installation. In addition, the original SurRon battery cover on the bike must be removed. We recommend choosing our own seat extender so every part lines up precisely.
Before mounting the pack, confirm that an upgraded controller is already installed on the bike. Skipping this step risks damage to your electronics.
Why Choose This Pack
Most competing packs rely on nickel strips to link their cells. This battery uses genuine copper busbars instead. As a result, contact between cells improves and imbalance drops noticeably.
Lower resistance across those copper connections also keeps working temperatures down. Cooler cells age more slowly, which extends the service life of the whole pack. Meanwhile, the Bluetooth app gives you full visibility into each cell group.
The metal housing and integrated sensors round out the package. Charging is blocked automatically outside safe temperature limits, protecting your investment through winter riding and summer heat alike.
Frequently Asked Questions
Does this battery fit the Sur-Ron Light Bee X?
- Yes, the pack is designed for both the Light Bee and the Light Bee X.
- A seat extender is required on both models.
- The original battery cover must be removed first.
Can I use this pack with the stock SurRon controller?
- No. Connecting it to the original factory controller is prohibited.
- An upgraded controller must be installed beforehand.
Which controllers work with this SurRon battery?
- BAC4000 and BAC8000.
- Torp TC500, EBMX X9000 and KO.
- Other currently popular upgraded SurRon controllers.
How much power does it deliver?
- Instantaneous peak output reaches 15 kW.
- Recommended continuous motor power is 11 kW.
- Riders report up to three times more power than stock.
Why copper busbars instead of nickel strips?
- Copper gives better contact between cells.
- Cell imbalance stays lower across the pack.
- Reduced resistance means less heat and longer life.
How do I monitor the battery?
- A Bluetooth app shows overall pack status.
- Voltage is displayed for each cell group.
- Temperature readings come from integrated sensors.
What protects the pack from overheating?
- Integrated temperature sensors monitor the cells.
- Charging is blocked at too-low or too-high temperatures.
- The metal housing shields against external damage.
This 72V 66.5Ah pack turns a Light Bee into a genuinely different machine. Samsung cells, copper busbars and a metal enclosure form the foundation. Pair it with an upgraded controller and a seat extender, then enjoy the range and power your motor was always capable of.
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