Have you ever heard about Ohm law?
If battery gives correct voltage, receiver will draw exactly as much as it needs. Current specification is there only to tell you whether charger is able to supply enough current. For example if some device needs 12V and 2A, and the charger is certified for 1A only it will probably blow sooner or later. But if your charger gives 12V and is capable of giving more current than the device needs, there is no problem.