This is a uninterruptable power supply. (UPS). It is designed to plug a piece of electronic equipment like a computer for protection against power outages and voltage spikes or fluctuating voltages. It will let you turn of your equipment if the power goes out for a long time.
It isn't a charger or a device to run something on for a very long time at all, It is for protecting sensitive electronic equipment like a high grade surge protector.