Leaving a cordless vacuum cleaner on the charger for long periods of time is generally safe with modern devices, as many of them are equipped with built-in charging management systems that prevent overcharging. These systems monitor the battery's charge level and automatically stop charging once it reaches full capacity. This helps protect the battery from damage caused by overcharging.
However, it's essential to refer to the manufacturer's guidelines and instructions for your specific cordless vacuum cleaner model. Different brands or models may have different charging recommendations, so it's best to follow the manufacturer's advice to ensure the longevity and optimal performance of your vacuum's battery.
If you're unsure about the charging recommendations or have any concerns about your cordless vacuum cleaner's battery, you can also contact the manufacturer's customer support for clarification. They will be able to provide you with the most accurate and up-to-date information for your specific device.