Why won't my Commuter 5 e-bike battery charge, and what does the charger light mean?

A red charger light means the battery is charging. Green means either the battery is full or the charger isn't making a connection to the battery. Connect the charger to the wall first, then to the battery, and try a different outlet. Check the battery charge port for grit or debris. If the light stays green at room temperature, the charger is likely faulty and can be replaced under warranty.