21700 battery cells have gained popularity in the electric vehicle industry due to their superior energy density, power output, and thermal performance. The Samsung 50S 21700 cells, in particular, have been widely recognized for their high capacity and efficiency, making them an ideal choice for electric skateboard applications.
Advantages of 21700 Battery Cells
High Energy Density: The typical capacity of 18650 battery cells can reach 2600-3500mAh, while the capacity of 21700 battery cells can reach 5000mAh. This is because 21700 battery cells have a higher energy density compared to traditional 18650 cells, allowing them to store more energy in the same physical space.
Tesla CEO Elon Musk has stated in 2017 that the power density of 21700 was the highest in the world. He noted that the energy density of the early 18650 battery system was about 250Wh/kg, while the later produced 21700 battery system has an energy density of around 300Wh/kg. Compared to traditional 18650 battery cells, 21700 have more than a 20% increase in density and a 35% increase in single-cell capacity. This indicates that switching from the 18650 model to the 21700 model results in a significant increase in the energy density of the battery cell. The increased capacity is more beneficial for extending the lifespan of electric skateboards. For example, OMW Cavalry and Hussar boards use Samsung INR21700-50S battery cells, which have a capacity of 5000mAh. This leads to increased range and longer riding times for esk8. 
Improved Power Output: The Samsung 50S 21700 cells are capable of delivering high discharge rates, providing the necessary power for acceleration and uphill climbs. This translates to a more responsive and dynamic riding experience for electric skateboard enthusiasts.
Enhanced Thermal Performance: The 21700 cells are designed to dissipate heat more effectively, reducing the risk of overheating and ensuring consistent performance even during demanding riding conditions. This is particularly important for electric skateboards, as they often experience high power draw during acceleration and braking.
Apart from the choice of battery cells, the configuration of the battery pack also plays a crucial role in determining the overall performance and reliability of electric skateboards. A 12S4P battery pack consists of 12 series-connected cells and 4 parallel-connected sets. For example, the Cavalry uses a Samsung 50S 12S4P battery pack. Each cell has a nominal voltage of 3.6V, and the nominal voltage of the 12 series-connected cells is 3.6 * 12 = 43.2V. Each cell has a capacity of 5000mAh, and the capacity of the 4 parallel-connected sets is 5000 * 4 = 20Ah. Therefore, the total energy capacity is 43.2V * 20Ah = 864Wh, which is how the Cavalry's battery capacity is calculated. This configuration provides various advantages for electric skateboard applications
Advantages of 12S4P Battery Pack Configuration
Extended Range: The 12S4P configuration allows for a higher overall capacity, resulting in an extended riding range for electric skateboards. This is particularly beneficial for commuters and long-distance riders who require a reliable and long-lasting battery pack.
Improved Reliability: By distributing the load across multiple parallel sets of cells, the 12S4P configuration reduces the strain on individual cells, leading to improved reliability and longevity of the battery pack. This helps to minimize the risk of cell degradation and ensures consistent performance over the lifespan of the electric skateboard.
Balanced Performance: The 12S4P configuration provides a balanced combination of voltage and current output, optimizing the power delivery to the electric skateboard’s motor and electronics. This results in smoother acceleration, better efficiency, and overall improved performance.
In conclusion, the choice of battery cells and the configuration of the battery pack are critical factors in determining the performance, range, and reliability of electric skateboards. The use of 21700 battery cells, such as the Samsung 50S 21700 cells, and a 12S4P battery pack configuration offers significant advantages in terms of energy density, power output, range, and reliability, making them an ideal choice for electric skateboard enthusiasts looking for a high-performance and dependable riding experience.
