At present, there are two kinds of batteries used in locomotives, one is lead acid and the other is nickel-cadmium battery. In addition, at present, there are many types of locomotives in each locomotive depot, generally using two speeds, but each type has some differences. Difference means that the individual parameters used are different. For example, the latest DF 1 1G locomotives use sintered nickel-cadmium batteries. Make an outline of what you want to know in detail, and I'll try my best to answer. Okay？ . . I'd love to.