Hi,
The Cube i9 charger is a 12V/2.5A so I guess you could find a replacement if you know the diameter of the cube connector (I think someone already asked this here or at XDa).
Another good alternative is to buy a UBS-C charger. I bought the “iVoler 75W USB type C charger” on Amazon and an “Aukey USB-C to USB-C 1m” and it works pefectly (plus you have 3 “standard” USB ports for your other devices).