Black Dual Cup Vehicle Charger for Bendix King BK KNG Portable Radios HH Cloning The strong magnet works well PARE1405 30093 200 The strong magnet works well on rental cars or truck fleets but those same AA batteries loaded into a AA battery pack and put into service on a radio that undergoes a 10 10 80 duty cycle will only last about as long as a 1400mAh rechargeable battery and Li Poly batteries have not become available for the RELM BK Radio KNG P series radios at time of publication This quad chemistry rapid rate charger will charge the original OEM Relm BK Radio Li Ion rechargeable batteries or any of the upgraded Li Ion rechargeable batteries for the RELM BK Radio KNG P series radios