I read "charger" to mean "the thing you use for charging", and not really bothering with the technical detail of exactly how this thing is made.
I think reading the texts as if they spoke only of the transformer/brick itself is to narrow, and not in line with the common understanding of what a "charger" is.
I will offer this suggestion of a precise definition for "charger": the complete technological assemblage required for transferring electrical power, suitable for storage, from a common wall socket onto the portable radio device.
Basically, if you have a wall socket, a mobile radio device, and a third thing, and they cannot be assembled so that the mobile can be charger, the thing is not a "common charger".
I think reading the texts as if they spoke only of the transformer/brick itself is to narrow, and not in line with the common understanding of what a "charger" is.
I will offer this suggestion of a precise definition for "charger": the complete technological assemblage required for transferring electrical power, suitable for storage, from a common wall socket onto the portable radio device.
Basically, if you have a wall socket, a mobile radio device, and a third thing, and they cannot be assembled so that the mobile can be charger, the thing is not a "common charger".