Battery-powered electric trolley

Battery-powered electric locomotives are powered by batteries. Battery charging typically occurs in the underground locomotive garage. Once the battery pack on the locomotive reaches a certain level, it is removed and replaced with a fully charged one. Therefore, each locomotive must be equipped with 2-3 battery packs.

Advantages: No spark-induced explosion risk, suitable for use in coal mines with methane; no need for wiring, flexible usage, highly applicable to transportation systems with low output and irregular tunnels, as well as tunneling and transportation operations.

Drawbacks: Requires charging equipment; high initial investment; low energy efficiency; higher transportation costs.