With the Patona Dual LCD USB Charger for Panasonic BLF19E DMWBLF19 DMW-BLF19, two batteries can be charged quickly, simultaneously, and independently of each other. It does not matter whether the two batteries have the same capacity. Additionally, the charger features a USB output that allows for parallel charging of third-party devices. The integrated microcontroller-controlled charging technology automatically detects the required voltage of the inserted battery and prevents overcharging or overheating. The charger has two charging modes: "L" for normal, battery-friendly charging and "H" for fast charging. Important information such as the charging status, active USB port, use of the car adapter, and charging mode is displayed on the LCD screen.