First, the difference between nickel batteries and lithium batteries is that the reserve power capacity is not the same. Nickel batteries generally store less energy and cannot be used for power batteries. Lithium batteries store more electricity and are widely used in power batteries, taking into account the driving range of the car.
Second, the two have different memories. Nickel batteries cannot be charged until the power runs out, otherwise they will not be charged. Lithium batteries have no memory, lithium batteries will not starve to death, no electricity can be charged.