attacks here. it involves a battery found in the blast debris. let me bring in cnn crime and justice correspondent joe johns. joe, what are your sources telling you? jake, a top executive with tenenergy corporation out of california confirms to cnn his company has been contacted by federal authorities. a mangled tenenergy battery was found at the location of the marathon bombing. that battery we re told is what this executive described on the phone to us as a nickel metal hrdry sub c-size battery the type of battery typically used in remote control hobby cars. and the executive of course telling us in his view it is appalling this battery would have been used in this way when especially it is intended for toys. this is a possible lead in the investigation. we ve been working under the