Dualtron Ultra 2 Upgrade (EY4) Electric Scooter

The Dualtron Ultra 2 Upgrade (EY4) represents the return of the undisputed queen of off-road electric scooters, re-engineered for riders who demand massive torque, structural resilience, and all-terrain dominance. Building upon the legacy of the original Ultra—the platform that defined extreme mountain and forest trail e-mobility—the Upgrade edition refines off-road handling with upgraded cockpit electronics, an improved stem folding mechanism, and an expanded signaling suite.

Propulsion is delivered by dual brushless direct-current (BLDC) hub motors generating 2000W nominal power each, resulting in a sustained powertrain output of 4000W continuous rated power. Electrical reserves are supplied by a massive 72V 40Ah battery pack engineered with authentic Samsung or LG M50LT 21700 cells (yielding 2880 Wh of capacity). This powertrain produces immense low-end torque, scaling severe mountain inclines of up to approximately 70% (35°) while achieving a manufacturer-declared range of up to 130 km in ECO mode.

The cockpit centers around the widescreen EY4 color display with native Bluetooth connectivity for the Dualtron mobile app (iOS / Android). Heavy-duty trail control is backed by 11-inch ultra-wide pneumatic off-road tube tires, a full NUTT hydraulic disc braking system with EBS electronic assistance, an ultra-bright 30W headlight, turn signals, an electric horn, and an integrated rear footrest to brace against sudden acceleration forces.

✅ Key Features

• Dual 4000W Nominal Powertrain: twin 2000W nominal hub motors (4000W continuous rated total) capable of conquering steep off-road inclines up to approx. 70% (35°).
• 72V 40Ah 21700 Battery Pack: assembled with genuine Samsung / LG M50LT cells delivering 2880 Wh capacity and up to 130 km of range in ECO mode.
• 11-Inch Ultra-Wide Off-Road Tires: knobby, deep-tread pneumatic tube tires engineered for maximum bite on loose gravel, mud, forest dirt, and sand.
• NUTT Hydraulic Braking System: front and rear hydraulic disc calipers clamping steel discs paired with an adjustable Electronic Braking Assistance system (EBS).
• EY4 Smart Display with Bluetooth: widescreen color instrument panel syncing with the Dualtron App (iOS / Android) for telemetry and light customization.
• High-Power 30W Headlight: elevated 30W front LED projector, tail brake lights, directional turn signals, chassis LEDs, and a loud electric horn.
• Refined Steering Geometry: taller folding clamp drastically reducing stem play, paired with handlebars widened by 85 mm to minimize rider fatigue.
• Dual Charging Architecture: dual charging input sockets reducing charge times down to approximately 8 hours when utilizing a 5A fast charger.
• Integrated Rear Footrest: structural rear platform designed to brace rider posture during hard acceleration phases while doubling as a carry handle.

Drivetrain and Performance

The dual-motor setup of the Dualtron Ultra 2 Upgrade features two brushless DC hub motors delivering 2000W nominal power per wheel (4000W total continuous nominal output). By applying immediate, high-torque traction across both axles, the scooter prevents front-wheel wheelspin on loose soil and scales demanding inclines of up to approximately 70% (35°).

The vehicle is software-limited to 25 km/h out of the box in compliance with European road mobility regulations. When operated on private tracks and delimited according to manufacturer guidelines, the scooter unlocks its full technical capability, achieving a maximum top speed of up to 95 km/h.

Battery Architecture and Fast Charging

The 72V 40Ah battery pack stores 2880 Wh of energy and utilizes high-capacity 21700 lithium-ion cells from Samsung or LG (M50LT), providing consistent voltage discharge under demanding uphill loads. Under standard ECO test parameters, the declared operating range reaches up to 130 km on a single full charge.

A multi-stage Battery Management System (BMS) continuously protects against short circuits, over-current, thermal spikes, over-discharging, and over-charging. Dual charging ports provide versatile charging options:

• Standard charging using a single 1.5A charger: approximately 26.5 hours,
• Fast charging using a single 5A fast charger: approximately 8 hours.

Chassis, Wheels, and Braking Dynamics

Engineered to withstand rigorous off-road punishment, the Ultra 2 Upgrade is equipped with front and rear elastomeric rubber swingarms that cushion sharp vertical impacts from rocks, tree roots, and trail ruts. The scooter rolls on 11-inch ultra-wide off-road tires with inner tubes, delivering exceptional lateral grip and stability over soft earth.

Stopping duties are managed by NUTT hydraulic disc brakes on both the front and rear wheels. The closed hydraulic circuit provides progressive, modulation-rich stopping power with minimal hand effort, assisted by an adjustable Electronic Braking Assistance system (EBS) that applies motor drag to prevent wheel lockups on slippery off-road surfaces.

Ergonomics, Dimensions, and Equipment

The Upgrade edition introduces an 85 mm wider handlebar assembly, giving the rider superior steering leverage over rugged terrain and reducing wrist and shoulder strain. The reinforced folding mechanism features a taller clamp and a wider range of motion for the upper and lower hinges, drastically reducing horizontal stem movement.

The chassis provides a ground clearance of approximately 180 mm and a wheelbase of 970 mm. In its unfolded riding configuration, the scooter measures 1260 x 685 x 1300 mm, collapsing down to 1260 x 685 x 750 mm via its folding stem and folding handlebar grips. Total vehicle curb weight is approximately 45.8 kg, rated for rider payloads of up to 120 kg. Standard equipment includes an EY4 display with Bluetooth, a 30W headlight, brake lights, turn signals, an electric horn, a reinforced kickstand, and a rear footrest platform.

Technical Specifications

Frequently Asked Questions (FAQ)

What updates does the Dualtron Ultra 2 Upgrade bring compared to the original Ultra 2?
The Upgrade version introduces the widescreen EY4 display with Bluetooth telemetry, an 85 mm wider handlebar for superior off-road leverage, a reinforced stem folding clamp that reduces stem play, a 30W headlight, directional turn indicators, and NUTT hydraulic disc brakes.

What is the motor power of the Dualtron Ultra 2 Upgrade?
The scooter is powered by two brushless hub motors rated at 2000W nominal power each, delivering a combined continuous rated output of 4000W.

What battery is installed in this model?
The vehicle is equipped with a 72V 40Ah battery pack (2880 Wh) composed of Samsung or LG M50LT 21700 cells, delivering a manufacturer-declared range of up to 130 km in ECO mode.

What is the top speed of the scooter?
The vehicle is capped at 25 km/h out of the box to comply with traffic regulations. When unlocked for private land usage, it can achieve a maximum technical speed of up to 95 km/h.

What brakes are fitted on the Ultra 2 Upgrade?
The model features NUTT hydraulic disc brakes on both the front and rear wheels, paired with an electronic braking assistance system (EBS).

What tires are fitted on the scooter?
The scooter rolls on 11-inch ultra-wide off-road pneumatic tires with inner tubes, designed with a deep tread pattern for dirt, mud, and trail riding.

How long does it take to charge the battery?
With a standard 1.5A charger, charging takes around 26.5 hours. Using a 5A fast charger reduces the charging duration to approximately 8 hours.

What is the function of the rear footrest platform?
The rear footrest provides an angled surface to brace the rider's rear foot during acceleration, stabilizing posture and vehicle control while doubling as a lifting handle.

Does the scooter connect to a mobile app?
Yes, the installed EY4 digital dashboard integrates Bluetooth to pair with the official Dualtron App on iOS and Android devices.