Since there will be a certain gap between the products of different lithium battery manufacturers and the products of different periods, the weight of lithium batteries can only be estimated based on the data of past experience. Generally, the electric energy ratio method is adopted. First calculate the capacity of the lithium battery. Here we know that it is 14,400 watt hours and that its weight is around 120 kilograms. for reference only.
72V40Ah, the energy is 72*40=2880Wh. The current energy density of lithium batteries can reach 200Wh/Kg, which is already very impressive. Let's calculate based on 200, the weight should not be less than 2880/200=14.4 kg. Basically, the weight is not less than 15 kg. This is a lithium-ion battery made of ternary materials. If it is made of lithium iron phosphate material, it will be very powerful if it can reach 130 Wh/Kg.The lithium iron phosphate battery is: 2880/130 = 22 kg. This is only the case for battery cells. If it is a module and BMS, structural parts, etc. are added, the weight will increase.
As for the price. Let's calculate the ternary battery at the cheapest price of 1.2 yuan/Wh. The price is 2,880 x 1.2 = 3,500 yuan. If it is a lithium iron phosphate battery, the price is nearly 6,000 yuan based on the cheapest price of 2 yuan/Wh.
The above calculations are relatively conservative, and the values are relatively reliable and can be used as a reference.