Blackberry phones are all over the place due to their speed, internet access, safety and reliability. The corporate world is flocking with Blackberry phones with their instant email access and all other applications. Naturally the demand for Blackberry chargers is also high. Blackberry chargers are of different types, in the sense that it can be charged by plugging it in the USB port of your computer and also by plugging it in any wall port. It is true that a connection to an USB port cannot harm Blackberry chargers as only the charger might be defective in this particular case.
An USB charger can only harm your Blackberry if it is defective by itself. The maximum that different USB chargers can do is charge your blackberry battery at a slow rate. A compatibility issue does not arise here and it is okay to use USB chargers as Blackberry chargers. These Blackberry chargers only draw the amount of current it requires and hence in a way it has the facility to tackle overcharging and short circuiting. Now it must be clear to you that specific Blackberry chargers are not required to charge Blackberry phones as other USB chargers can suffice for it.