What does this mean?
If you have a battery inserted in your Battery Charger with the correct polarity, a single red light indicates a fault with the battery. Remove the battery and reinsert. If the Red light is still appearing, please contact your local Distributor or DermapenWorld at https://www.dermapenworld.com/contact-us
If you do not have a battery inserted into your Battery Charger but it is connected to a Power Source, the red light just indicates that there is no battery inserted and the charger is powered On.