Shimano EC-E6002 Portable 42V DC Charger for STEPS E-Bike Systems

The Shimano EC-E6002 charger is architected as a high-frequency switching power supply, converting universal AC input (100-240V, 50/60Hz) into a stable 42V DC output at 1.8A, yielding a rated power of 75.6W. This output voltage is specifically tailored for 10-series (10S) Li-Ion battery packs, where 42V represents the peak charge voltage (4.2V/cell * 10 cells). The charging process strictly adheres to a 2-stage Constant Current (CC) / Constant Voltage (CV) protocol. Initially, the charger operates in the CC phase, delivering a constant 1.8A current until the battery voltage approaches 42V. Subsequently, it transitions to the CV phase, maintaining a constant 42V while the current gradually tapers off as the battery nears full charge. This precise algorithm is critical for preventing overcharging and maximizing the lifespan of 36V Shimano STEPS Li-Ion batteries, particularly those within the 418Wh to 630Wh range. Thermal management is entirely passive, relying on the compact plastic enclosure and internal heat sinks for dissipation. Operating within a 0°C to 40°C ambient temperature range, the fan-less design ensures silent operation and reduces potential points of failure from moving parts. Crucially, the unit incorporates a comprehensive suite of protection features: Over-Voltage Protection (OVP) and Under-Voltage Protection (UVP) on the input, Over-Current Protection (OCP) at the output, Short-Circuit Protection (SCP), and Over-Temperature Protection (OTP) for internal components. These safeguards ensure stable operation and prevent damage to both the charger and the connected Shimano STEPS battery pack, complying with CE safety standards and featuring electrical isolation for user safety.