[Bigsmith]

Phones have current regulation circuitry, so (within reason) you don't have to worry about a mini usb charger hurting a phone by putting out too much current. The phone will draw what it needs and the internal regulation circuitry will only pass a safe current level to the battery and electronics. This is unlike (for example) charging a standalone battery, which contains no such circuitry and can be damaged by a "dumb" charger that outputs excessive current.

On the other hand, it IS possible for a charger to NOT output enough current to be able to charge a particular phone, even slowly. I know from personal experience that not every generic mini usb charger puts out enough current to charge the TP2. I have several such chargers that charged my Mogul just fine but won't charge the TP2. When I plug these chargers to the TP2 the device displays an alert message along the lines of "battery is not receiving enough current to charge" (I don't remember the exact wording). In other words, the TP2 requires a greater charging current than the Mogul. So your Motorola bluetooth charger may or may not work, just try it and see.