Lithium-ion forklifts are widely applied in modern warehouse, manufacturing and logistics scenarios for reliable performance, and most operators are familiar with the nominal rated capacity marked by manufacturers under standard load-centre distances. However, in actual daily operations, many teams have demands for handling extra-long goods, installing special attachments or adjusting fork extension lengths, which will extend the actual load-centre distance beyond the factory standard setting. A large number of operators easily ignore the corresponding adjustment of rated capacity under such working conditions, which may bring hidden safety risks to production operations.

The nominal rated capacity of a lithium-ion forklift refers to the maximum safe load verified by the manufacturer under the preset standard load-centre distance, standard mast height and unmodified vehicle structure. Different from internal combustion forklifts and traditional lead-acid forklifts, the battery module of lithium-ion forklifts can be reasonably arranged as part of the counterweight system to make the whole vehicle's center of gravity more balanced, but this structural feature cannot offset the torque change brought by the extended load-centre distance. When the load-centre distance exceeds the standard value, the overturning torque formed by the load acting on the front support point of the forklift will rise significantly. To keep the whole vehicle within the safe stability range, the actual allowable rated capacity of the forklift will decrease correspondingly, instead of remaining consistent with the nominal value.

The specific decline range of rated capacity is affected by multiple related factors. When the extended load-centre distance is kept the same, if the working height of the mast is raised at the same time, the overall center of gravity of the load will move further upward, and the actual allowable rated capacity will drop more obviously. Operators should check the official load indication label on the vehicle body before carrying out special operations, and adjust the maximum allowable load strictly according to the corresponding parameters under different extended load-centre distances, rather than directly using the nominal rated capacity for operation.

In actual daily work, relevant management personnel can arrange targeted training for frontline operators to help them master the calculation logic of load-centre distance and the change rule of rated capacity. When it is necessary to frequently work under extended load-centre distances, operators should control the driving speed, avoid sudden steering and emergency braking behaviors, and carry out regular stability check and maintenance of the forklift, to ensure that the material handling process always runs in a safe and compliant state.