The safety of electric scooters hinges significantly on the quality of their components, with particular emphasis on the battery. We exclusively collaborate with suppliers who uphold stringent product safety protocols. Our batteries are sourced from reputable manufacturers, including Korean companies such as LG and Samsung, or from Chinese cells that have undergone extensive testing and have demonstrated long-term reliability.

Each scooter possesses unique capabilities and constraints. We strongly advise familiarizing yourself with the user manual before operation and adopting a gradual approach to riding. Additionally, it is imperative to wear appropriate protective gear, including helmets, knee/elbow pads, and wrist guards, at all times.

Several differentiating features distinguish the D4+2.0 from the D4+4.0, notably in their suspension and braking systems. The D4+2.0 is equipped with dual spring front and rear suspension, complemented by front and rear EBS disc brakes. In contrast, the D4+4.0 boasts a C-type design featuring front and rear hydraulic spring shock absorbers. Additionally, the D4+4.0 model is furnished with a sinewave controller and includes a steering damper, contributing to an exceptionally smooth riding experience.

Ease of repair is a hallmark of the D4+4.0, as many components are designed for straightforward, plug-and-play functionality, facilitating at-home repairs with ease. Another point of differentiation lies in the color options available; while the D4+2.0 is offered in black, the D4+4.0 is available in blue, providing consumers with varied aesthetic preferences.

Here is the manual on how to install the steering damper on the D4+3.0 and D4+4.0: https://cdn.shopify.com/s/files/1/0276/7126/5364/files/D4_new_damper.pdf?v=1709765415

More About Steering Dampers

1. What is a steering damper on an electric scooter? A steering damper, also known as a steering stabilizer, is a device designed to reduce unwanted vibrations and oscillations in the handlebars of an electric scooter. It enhances stability and control by minimizing the impact of road irregularities and sudden movements on the scooter's steering.
2. Why do electric scooters need a steering damper? Electric scooters, like other two-wheeled vehicles, can be affected by factors such as road imperfections, wind gusts, and sudden maneuvers. A steering damper helps dampen these external forces, providing a smoother and more controlled riding experience.
3. How does a steering damper work? A steering damper operates by using hydraulic or mechanical means to absorb and dissipate excessive forces that can lead to unwanted handlebar movements. It acts as a buffer between the handlebars and the scooter's frame, reducing the impact of shocks and vibrations.
4. What are the benefits of having a steering damper on an electric scooter?

• Improved Stability: Reduces wobbling and instability caused by road conditions or sudden maneuvers.
• Enhanced Control: Minimizes handlebar kickback and promotes smoother steering response.
• Increased Safety: Helps prevent speed wobbles and improves overall rider confidence.

Although sharing identical framework and internal components, two primary distinctions set apart the RoadRunner D4+4.0 and the Nanrobot D4+3.0 models. The RoadRunner D4+4.0 is furnished with a standard steering damper, provided as part of the purchase package, and features a comprehensive one-year manufacturer's warranty. Conversely, the Nanrobot D4+3.0 does not include a steering damper and is backed by a six-month manufacturer's warranty.

Our lithium-ion battery packs, available in various sizes, typically exhibit a lifespan of 400-700 charging cycles. Over time, a natural decrease in riding range and maximum voltage occurs due to the inherent chemistry of these batteries, leading to diminished cell capacity.

For comprehensive insights into extending battery lifespan, please refer to the accompanying article.

Outlined below are fundamental tips:

1. Maintain an optimal temperature: Avoid exposing batteries to excessive heat during charging or operation. While lithium-ion batteries are more resilient in cold conditions compared to other types, extreme temperatures compromise their energy storage and release capabilities. We recommend storing your scooter within a temperature range of 50°F to 70°F for optimal performance.

2. Ensure adequate airflow: Proper ventilation is crucial for battery health, as it helps dissipate heat and maintain operational efficiency.

3. Prevent exposure to moisture: Avoid riding through puddles or snow, as moisture infiltration into the battery can cause damage. Please note that water-damaged scooters are not covered under our warranty guarantee.

4. Opt for slower charging: Particularly for smaller battery packs, a slower charging rate (such as with the standard 2A chargers provided) is preferable to preserve battery life.

5. Avoid overcharging: While our chargers feature automatic shutdown mechanisms upon reaching full charge, it's advisable to disconnect the charger from the scooter's charging port once charging is complete (indicated by a green light).

The primary distinctions between the D4+4.0 and the RS5 MAX lie in their motor power and battery specifications. The D4+4.0 features a 2000W (1000W x 2) dual motor, achieving a maximum speed of 40mph*. In contrast, the RS5 MAX boasts a robust 2800W (1400W x 2) motor, capable of reaching speeds of up to 50mph*.

Regarding battery capacity, the D4+4.0 is equipped with a 52V 23Ah lithium-ion battery, offering a range of up to 40 miles*. Conversely, the MAX features a detachable 52V 32Ah lithium-ion LG battery, providing an extended range of up to 60 miles*.

Furthermore, the MAX model presents enhancements in its design, including updated LED lighting and a relocated headlight for enhanced visibility. Additionally, it features a new deck lid key lock, replacing the previous model's combination lock, along with a louder horn to ensure rider safety.

*Please note that actual ranges and speeds may vary based on the rider's weight and riding style.