https://eu.traxon-ecue.com/products/lightdrive-wifi/
A goldcap provides enough energy to remember date/time for ca. 1 hour.
It could be misunderstood that date/time will be remembered permanently.
Lightdrive+ resets date/time to 1/1/1900 at 12:00 AM
The LIGHTDRIVE+ Wifi has no battery inside.