Like others have said here DO NOT use aftermarket chargers for your BB or cell phone. A friend just learned this lesson with his Nextel phone who ruined his new i860 with a aftermarket charger. It simply fired the phone and would not even turn on after using this charger for a few minutes. He smelled something burning and looked at his phone. It was hot with a blank screen.
Pay the extra few bucks and get the OEM charger.