It is not recommended to charge your 7-volt portable vacuum cleaner using a 5-volt phone charger. Charging a device with a higher voltage than it is designed for can lead to several issues:
Inadequate charging: The 5-volt phone charger may not provide enough power to properly charge the 7-volt vacuum cleaner. This can result in very slow charging or no charging at all.
Damage to the charger: Using a charger with an output voltage lower than the device's requirement might put a strain on the charger, potentially damaging it in the long run.
Damage to the vacuum cleaner: Attempting to charge the vacuum cleaner with the wrong voltage can damage its battery or internal components, rendering the device unusable.
To avoid any potential issues and ensure the safety and proper functioning of your vacuum cleaner, it is essential to use a charger that matches the device's voltage requirement. Check the user manual or any labeling on the vacuum cleaner to find the correct charging specifications. If you don't have a charger that came with the vacuum cleaner, consider contacting the manufacturer or searching for an appropriate replacement charger that matches the required voltage and current specifications.