How to do if the battery of handheld vacuum cleaner drains fast？      

In the standard mode, when using the crevice tool vacuum head, the battery life is around 30 minutes. The battery life when using the ground brush to vacuum short fiber carpeting is around 2 minutes. When using the bed brush to clean a smooth tile surface the battery life is around 25 minutes. In MAX mode when using the crevice tool vacuum head, the battery life is about 6 minutes. The battery life in MAX mode when using the bed brush or ground brush is about 8 minutes.
The temperature and cleanliness of the vacuuming surface can affect the battery life. The above data is for reference only.