The AirSep 2-bay external battery charger is capable of charging the AirSep Focus, FreeStyle 3, and FreeStyle 5 8-cell external battery. Finally a reliable and speedy option to externally charge your 8-cell battery that reduces wait time to get you on your way quicker. This charger offers simultaneous charging capabilities, allowing you to charge up to two 8-cell batteries externally. The external battery charger offers its own AC power supply and is the only way to recharge the 8-cell external battery. A fully depleted AirSep 8-cell battery will take up to 5 hours to charge. The external battery charger displays the status of the battery with an LED light throughout the duration of charging: a flashing green light indicates battery is charging, a solid green light indicates the battery is fully charged, a flashing red light indicates an error, and a solid red light indicates no battery inserted. The charger measures 4" W x 5" L x 2" H and includes a 7 ft power cord.