Gladiator 66 Max - 51ah Sur-Ron Battery
Gladiator 66 Max - 51ah Sur-Ron Battery
Gladiator 66 Max - 51ah Sur-Ron Battery
Gladiator 66 Max - 51ah Sur-Ron Battery
Gladiator 66 Max - 51ah Sur-Ron Battery
Gladiator 66 Max - 51ah Sur-Ron Battery

Gladiator 66 Max - 51ah Sur-Ron Battery

Regular price$2,475.00
Shipping calculated at checkout.

Connector Option
  • Route Package Protection

This Battery is made to order and is expected to ship in 1-2 weeks after purchase. Lead times vary based on order volume and we will try our best to beat our fulfillment estimate. Thanks for understanding! 

Introducing the Gladiator 66 Max, a game changing upgrade for your Sur-Ron. This 66V battery boasts additional power and speed - all while utilizing your stock controller. Want to kick it up a notch? When you are ready to upgrade your controller the 66 Max will deliver even more performance. Halfway in-between 60V and 72V, this battery offers a unique experience.

Now comes in a steel enclosure, which is built in-house starting with a sheet of raw steel that is bent, welded, powder coated, and laser engraved by our highly trained fabrication team. Features an injection molded lid with relocated discharge wires. 

How does it stand in our lineup? 

Are you having trouble deciding between 60V and 72V? Don't worry, we have an answer for that. The 66 Max is perfect for riders looking to begin their upgrade journey. Providing more range, power and speed, it is an all-in-one package for your Sur-Ron. It achieves this by utilizing the extra tolerance in your stock controller. For those who already have an upgraded controller, the 21700 Molicel cells give you 28kw of real world continuous power to work with (38kw peak). The 66 Max requires you to swap your stock base plate with a new one, which is included with your order. If you’re looking for a drop-in option with plenty of power, we recommend checking out the 66 Compact

If you are mostly interested in range, checkout our 60V Sur-Ron Batteries, also compatible with your stock controller. Already upgraded to an aftermarket controller and have a need for even more speed? Our 72V Sur-Ron lineup might be of interest to you! The 66 Max requires a new charger, and will not be compatible with the stock charger. A standard charger is provided with this battery for free, or you can upgrade to a Variable charger. Compatible with 2024 Sur-Ron but requires QS8/QS10 version of the battery. 

Order cancelation requests after 72 hours are subject to a 25% re-stocking fee. All battery sales outside of the lower 48 are final and cannot be refunded or returned. Battery servicing for Hawaii customers is outsourced to a local repair center. If you are having issues with a product please reach out to our support team.


High power battery that offers 20% more power on a stock controller and up to 28Kw of continuous power on an aftermarket controller (38kw peak). Gain around 10%-20% more speed with the stock controller (varies depending on set up). Includes new custom steel enclosure, upgraded discharge wiring and connector, reinforced carrying handle, injection molded battery cap, and hardware for stock-lid fitment. Comes standard with QS8 connector and upgraded wiring (7 AWG). Select Supra option for stock harness compatibility. Also now available with QS10 and 6 AWG. 

The 66 Max is built in-house using grade A 21700 Molicel cells with a Smart BMS and custom PCB. It can deliver 420 Amps of continuous discharge and 540 Amps peak. Provides high performance throughout discharge and includes overcharge protection. Pure nickel is used in construction, allowing the battery to run at staggeringly high efficiency and eliminating the possibility of overheating. Cell groups are isolated for superior durability, impact resistance, and each individual cell is fused for safety.


Add On

QS8 Bike Harness:

This is a harness cable upgrade for your Sur-Ron, replacing the OEM bike harness to provide higher current capability. Comes with a Male QS8 connector with 7 AWG. This harness cable is not used with the Sur-Ron breaker, which can be removed from the bike, giving you more space for wire routing.  The harness comes with an inline fuse pre-installed. Meant to be paired with the QS8 connector version of this battery. QS10 versions of this harness with 6 AWG also available. 

How to correctly use the connectors: Plug in the first half of the connector for 3-5 seconds to allow for the filter capacitors to pre charge before making the full connection.

Variable Rapid Charger - Optional Add-On (100-120v only):

Revolutionary solution for your charging needs! Our Variable Rapid Charger provides you a tremendous amount of flexibility in one simple package. Need a lightning-quick charge while you’re out on the town? Turn it up to get the juice you need. Home for the night? Turn it down for a super healthy and slow charge.

  • 5 charging modes - 2 amp, 4 amp, 6 amp, 8 amp, and 10 amp
  • Set charge target - 80%, 90%, 100%
  • Active Cooling, chargers faster than Sur-Ron stock fast charger, tried and tested, ground pin on outlet plug


With leading build processes, a highly trained staff, and top of the line equipment, our batteries are built to be superior in safety and reliability. Utilizing unique build techniques such as cell-level fusing, our products meet the highest standards of safety available - we do not cut any corners.


Our dedicated customer service team ensures you will always receive the quickest and most comprehensive service and support available for your battery. As the largest dedicated PEV battery manufacturer in the U.S.A., we offer the fastest delivery times, all over the globe.


Do It Yourself! All of our products are designed so that you can install your new battery from the comfort of your own home. Just follow our guides to learn how. Longer rides are on the other side of the door - and we give you the key!

Guides and Info

Learn everything you need to know about your new battery upgrade so you can hit the ground rolling!


Additional Info / Disclaimers

We test all of our batteries thoroughly with comprehensive QC measures before shipping to prevent any DOA's or issues. We cannot offer a warranty on your OEM device as our battery is an aftermarket modification, all units are tested before shipping. Use of our battery will void your vehicles warranty with the OEM manufacturer.

*This is a genuine ChiBatterySystem product. Use of brand names such as Onewheel, Super73, Evolve, ETC., are for purposes of identifying the application of this product and does not indicate any affiliation, endorsements, license or other association with the aforementioned product.