So to have a clear answer: There is nothing proprietary about the Librems’ current connector.
A bit more clear for all that would prefer not ordering from Librem or after it is not available any longer …
- It is a “Coaxial power connector” with 5.5 (outer diameter) x 2.5mm (pin-hole diameter) – sometimes called barrel-connector.
- (The PSU delivers) output: 19V at 2.1A for the device.
- (Mine is a) EU Version, input says: 100-240V~ 1.0A 50-60Hz