Make sure that the charging station is connected to the power outlet.
Fully charging a single battery usually takes 4 hours.
The battery will not be charged if the indoor temperature is below 5 ℃. Only charge the battery when indoor temperatures are between 5 ℃ and 38 ℃.
The battery will eventually need to be replaced. Due to the battery characteristics, runtime is shortened after using the appliance repeatedly for an extended period without charging or if the battery is charged when its hot from use.
The last bar on the battery indicator begins to flash when the battery needs to be recharged. Continuing to run the unit until it turns off when the last bar is flashing will also reduce its life span. Use the appliance with a fully charged battery.