Charging a 3800mAh battery using the side jack To charge the BL-5L 3800mAh battery you must purchase a: - TYT TH-UVF9 battery charger for 110VAC or - TYT TH-UVF9D for 12VDC. - These are fully regulated chargers - Plugs directly into side of battery, not a charger base - The AC wall wart has a charging indicator. Red while charging, Flashing Green Red when charged.