# Chapter 5 Maintenance

## 5.2 Charging

After disconnecting the battery from the trolley chassis, charge it with the dedicated battery charger delivered by our company. It takes about 5 hours to fully charge the battery.

The two output wires of the battery are connected in parallel, so both heads of it can be used for charging and discharging. The battery supports simultaneous charge and discharge.

## 5.3 Wheel loosening or skidding

Solution：Re-tighten the screws in the figure above