Make sure that the adapter is connected to both the charging station and the power outlet.
Fully charging a single battery usually takes about 4 hours. It will take twice as long to charge both the main and auxiliary batteries.
The battery will not be charged if the indoor temperature is below 41 °F (5°C). Only charge the battery when indoor temperatures are between 41 °F (5°C) and 100 °F (38 °C).
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.
The last bar on the battery indicator begins to blink when the battery needs to be recharged. Use the appliance with a fully charged battery.
If the main battery is charging on the charging station, the auxiliary battery will only start charging once the main battery is fully charged.
To maintain battery life on dual-battery models, swap the positions of the two batteries periodically, between the main body and the auxiliary charging station.