The dimensions of batteries for two-wheeled electric vehicles vary depending on the battery type, capacity, and specific vehicle model. Currently, electric vehicle batteries on the market primarily fall into two categories: lead-acid batteries and lithium-ion batteries. Lead-acid batteries tend to be relatively large in size, whereas lithium-ion batteries-thanks to their higher energy density-feature a much more compact overall volume. A common 48V 20Ah lead-acid battery typically consists of four individual 12V units; each unit measures approximately 181 mm × 77 mm × 170 mm, and when assembled, the complete battery pack occupies a substantial amount of space within the battery compartment.
For 60V and 72V battery systems, the overall dimensions increase further due to the higher voltage requirements, which necessitate a greater number of internal battery cells. For instance, a 60V 20Ah battery pack typically comprises five individual units, while a 72V 20Ah pack requires a combination of six units; consequently, the length and height of the battery compartment located at the base of the vehicle must be increased accordingly. Certain high-capacity models are also equipped with 32Ah or 45Ah batteries; these units are not only larger in size but also significantly heavier, and they are primarily utilized in electric two-wheelers designed for extended range or high-power performance.
Lithium-ion batteries offer greater flexibility in terms of dimensional design; for a given capacity, their volume is typically about 30% smaller than that of lead-acid batteries. As a result, many new electric two-wheeled vehicle models are now adopting lithium-ion battery solutions. Lithium-ion batteries can be custom-shaped to meet the specific requirements of a vehicle model, making them easier to integrate into various frame structures; simultaneously, they help reduce the overall weight of the vehicle and enhance range efficiency.