Humid and rainy weather can create hidden risks for electric transfer carts, affecting electrical components, batteries, motors, brakes, wheels, and structural parts. Moisture, condensation, corrosion, and water ingress may cause unstable operation, reduced battery performance, abnormal noise, longer braking distances, and unexpected shutdowns. This article explains common problems caused by damp conditions and provides practical protection, maintenance, storage, and pre-season inspection measures. It also discusses equipment selection, waterproof protection, anti-corrosion treatment, and custom designs for reliable transfer cart operation in harsh humid environments.