If you have any questions about the product, please contact our colleagues through our email https://www.vevor.com/pages/contact-us so that our colleagues can help you solve the problem.
Can the DC power be plugged in at the same time as the battery? For example if the electricity goes out the battery would also be plugged in and take over until electricity is back on. Or can only one power method be used at one time?
You can only select one power source at a time, since there is only one charging port.
If this answer does not resolve your issue, please contact us again for assistance.
