1 .Working principle The KPX series transfer car is powered by storage battery, which is installed in the car. The battery offers power to DC motor via the electrical control system, which enables the car to stop, go forward or backward, and regulate speed. 2. Advantages Safe and convenient operation You can charge the battery on the car, when it stops using. Unlimited running distance Adjustable speed Remote control available 4. Your attention:: Battery service life is generally 2.5 years, if you maintenance well, it can be used for longer. Battery charging time is 8-10 hours, operation time is 4-5hours with full load and continuous work.