Sur Ron Battery 72v 55Ah DominatorV3 28Kw (ASI, EBMX, Torp, KO, Compatable)

Original price was: £2,599.00.Current price is: £2,399.00. (price including VAT)

Sur Ron Battery 72v 55Ah DominatorV3 28Kw (ASI, EBMX, Torp, KO, Compatable)

8 in stock


Sur Ron Battery 72v 55Ah DominatorV3

ASI, EBMX, Torp, KO, Nuclear, Compatible

High Power Long Range 3960Wh
Samsung 50s 21700 Cylindrical Cells
Tough Protective 316 Stainless Steel Case
Fully Protected BMS
Highly Efficient Pure Copper Connections
Parallel Discharge Using Supra D6 and QS8 Connectors
*UK Warranty

Shipping: UK next day (free).
EU land ship available, bank transfer only
(For EU please email:

We dispatch within three working days.


This is a 72v 55Ah Battery capable of peak 28kW power (360a peak discharge for 51 seconds until cut off on mosfet temp protection)

15kW continuous at 200A discharge run for 4 minutes and 16 second continuous load until cut off on mosfet temp protection.

Our premium battery just got better!!! We swapped out the brilliant Molicell P42A and upgraded to one of the most expensive cells money can buy: The class leading Samsung 50S 21700 cylindrical steel jacketed cells (no puffy cheap pouches here). These cells give almost 20% more range than the Molicell and can supply the monster amp draw our controllers require.

We then swapped out our standard 330A BMS for a special order 400A BMS. This means these batteries can now continuously supply 180 amps and burst to 400A. This new super high output power can now handle bikes with the extra powerful: Sotion, EBMX and KO motors; yet keep the std OEM Sur Ron motor  running for huge long rides.

We then upgraded the casing from Stainless steel 304 to marine grade 316 so absolutely no rust issues here! Super tough and powder coated inside and out.

Also by no mean feat we massively improved the internal transfer of power by replacing all the connectors with pure copper sheet. This lowers resistance, reduces internal heat and make the battery even more efficient as it delivers sustained higher power to your controller.

The main battery to controller connectors we use are the same type as used by Sur Ron but we use two sets to share “parallel” the power. This reduces heat, transfers load more efficiently and keeps the connectors from overheating.

The 72 55AH Sur Ron Battery 20S11P 72v  3960Wh Samsung 50s 21700cell. The UK retail price of these cells is over £9.99 each!! The Cells are genuine branded cells specifically designed for high output discharge and sustained high drain. Other inferior cells (pouch) used in cheaper packs simply can’t deliver like these.

Our last and most recent upgrade is to supply one direct set of discharge cables to the controller via a high capacity qs8 connector using very large 6AWG cables (this reduces internal resistance and heat build up) and a separate second set of discharge cables using the original 8 AWG cable  via a Supra D6 connector to the OEM loom via circuit breaker. This means all your bike accessories are still powered. Some believe that not using the circuit breaker direct to the controller  removes the safety of the circuit breaker. However all our batteries have a full working BMS. Any power shorts or irregular current and the BMS shuts down,  Much more sensitive and accurate than a mechanical breaker (You may note that the Sur Ron Ultra Bee does not use a circuit breaker and relies on the BMS alone)

For bike that do not have a display to show voltage, We include a handlebar mounted display to be located on the throttle side. Simply plug into the charge port of the battery when riding.


The battery uses two sets of discharge cables. One to fit the original bikes connector (for Talari we supply an adapter so it can also fit a Sur Ron too). The second goes to an additional cable that we provide that is fixed direct to the controller. This enables the power to be fed “In Parallel” increasing the electrical flow, reducing resistance and reducing harmful heat. It shares the power delivery and takes the strain away from the original loom. However these must be connected in a correct order (Simple instructions supplied)

Torp do not like direct power to the controller 9our second cable), so please just do not use the additional power cable. We do not like to remove these as often buyers transfer batteries to another bike.


Weight 19.2KG
Cells Samsung 50S 21700 (220).
BMS set at 400  Amps Peak.  Full battery protection including over discharge (shorts) over heating etc.
Each cell with additional individual wrapping for added protection.
Additional layers of fibre board, Kapcon tape, heat shrink with internal/external powder coated stainless steel sealed box to give maximum protection and insulation.
Pure copper sheet for connections (not Nickle sheet)
Bluetooth BMS giving individual series condition with balanced charging. We do not recommend altering our settings as may invalidate your warranty.
An integrated handle for lowering the battery in and out.
Charging port via an XT60 connector.
Battery lid hinge extenders for Sur Ron
Brand: Samsung
Model: 50S
Size: 21700
Chemistry: INR
Nominal Capacity: 5000mAh
Nominal Voltage: 3.6V
Discharge: 35A Max Continuous
Positive: Flat/Button Top/Tabs (please select)
Protected: NO
Rechargeable: Yes
Dimensions: 21.1mm x 70.4mm
THIS KIT DOES NOT INCLUDE A CHARGER. Chargers can be found here (10A MAX):

When connecting the battery to the bike and to avoid a spark, turn the red trip switch on the bike to off. Connect the older original power cable and then turn the red trip to on. Then connect the new power leads. Removing battery has no special order.

Charging: First time charging is VERY important. Always connect the charger to the battery with the charger powered up from the mains. This will stop a “Connection Spark”. The battery needs a “Balance Charge” on first charge. Please charge for 12 hours first time.

Please note, Lithium batteries are considered hazardous and due care and attention should be taken. Although these cells are in wide use, and professionally manufactured in a purpose built factory; because of the power of the battery, we strongly recommend that precautions are taken. We do not recommend charging inside the family home and charging should be supervised. We take no responsibility for misuse. These batteries are thoroughly tested (full discharge and charge cycles at the manufacturing stage and also pre-delivery). These are not DIY or amateur built devices.

This will not work with the original X Controller.

* Warranty, due to the nature of use of these devices  (off road) warranty is limited to 12 months from date of purchase. Any damage the result of water ingress, alteration, may void warranty. Failure comply with the correct connection procedure, may lead to damaged to the BMS and connection plugs and will not be covered by warranty. This includes shortening of cables and changing connectors. It is the owners responsibility to proof against water ingress and not use in unacceptable very wet conditions, or use direct water from hose/washers. Any alteration modification to this controller or its subsequent wiring, even cutting the power leads to make shorter will immediately invalidate any warranty. Even battery disconnected, the controller can still maintains current and can be shorted/damaged. The controllers are waterproof, but can still suffer from water damage through the connector and hence are not covered for water damage.
Attempting to reprogram the controller may cause damage.
Warranties are not transferable. We do not warranty second hand goods.
We reserve the right to slightly modify or change this product without notice.

** Bike not included


Buyer releases Electron Cycles or any person trading on or behalf of the business known as Electron Cycles from any liabilities, therein known as Electron Cycles (expressed or implied, arising by law or otherwise) that may occur from the use of products sold by Electron Cycles and purchased by Buyer. These products are being sold for “Off Road/Competition Use” only and may be used only on two wheel vehicles (bicycles, electric bicycles, two wheel electric powered vehicles) used solely for “Off Road/Competition” (off-road being defined as a private land with land owners permission and not public highway or byway). The Buyer also recognises that Lithium batteries are classed as hazardous and should not be: stored, used, charged in place, facility any area that is not fire proof or safe to do so. That batteries should not be taken into the family home, office, workplace or school place. No other applications are intended or implied. The Buyer of product sold or provided by Electron Cycles acknowledges and agrees that Seller disclaims any warranty and expressly disclaims any liability for personal injury or damages or any damages to vehicle, expensed occurred, personal property or third persons. Electron Cycles will uphold the warranty of the manufacture of the product sold for a period of six months from date of purchase from manufacturer defect. In the event a manufacturer’s warranty exists, it is agreed and stated that under no circumstances shall the seller or manufacturer be liable for any labour charged or travel time incurred in diagnosis for defects, removal, or reinstallation of this product, or any contingent expenses.







Additional information

Weight 19.99 kg
Dimensions 50 × 30 × 25 cm