A portable power supply system, comprising: a battery pack; a voltage controller; a first electrical device; a second electrical device; and a charging and discharging container having a housing with a receptacle, the receptacle configured to removably receive and electrically connect to the battery pack, a power input connector (212, 214) configured to receive input power from an external power supply, a power output connector configured to deliver an output power from the battery pack, wherein the power output connector is electrically coupleable to the first electrical device to power the first electrical device when the battery pack is received in the receptacle, and wherein the battery pack is electrically coupleable to the second electrical device to power the second electrical device when the battery pack is removed from the receptacle; wherein the power input connector is configured to receive AC input power and the receptacle is configured to receive DC input power from the battery pack and the received DC input power is combined with the AC input power and the combined DC input power and AC input power is delivered to the power output connector; wherein the DC input power and the AC input power are coupled to the power output connector in parallel or in a simultaneous manner; characterized in that it further comprises a switch network configured to selectively connect the DC input power and the AC input power to the power output connector; wherein the voltage controller is configured to selectively connect the DC input power and the AC input power to the power output connector either by alternating between a state where only the DC input power is provided to power output connector and a state where only the AC input power is provided to power output connector or by operating in a state where both the AC input power and DC input power is provided to power output connector. a battery pack; a voltage controller; a first electrical device; a second electrical device; and a charging and discharging container having a housing with a receptacle, the receptacle configured to removably receive and electrically connect to the battery pack, a power input connector (212, 214) configured to receive input power from an external power supply, a power output connector configured to deliver an output power from the battery pack, wherein the power output connector is electrically coupleable to the first electrical device to power the first electrical device when the battery pack is received in the receptacle, and wherein the battery pack is electrically coupleable to the second electrical device to power the second electrical device when the battery pack is removed from the receptacle; wherein the power input connector is configured to receive AC input power and the receptacle is configured to receive DC input power from the battery pack and the received DC input power is combined with the AC input power and the combined DC input power and AC input power is delivered to the power output connector; wherein the DC input power and the AC input power are coupled to the power output connector in parallel or in a simultaneous manner; characterized in that it further comprises a switch network configured to selectively connect the DC input power and the AC input power to the power output connector; wherein the voltage controller is configured to selectively connect the DC input power and the AC input power to the power output connector either by alternating between a state where only the DC input power is provided to power output connector and a state where only the AC input power is provided to power output connector or by operating in a state where both the AC input power and DC input power is provided to power output connector. a charging and discharging container having a housing with a receptacle, the receptacle configured to removably receive and electrically connect to the battery pack, a power input connector (212, 214) configured to receive input power from an external power supply, a power output connector configured to deliver an output power from the battery pack, wherein the power output connector is electrically coupleable to the first electrical device to power the first electrical device when the battery pack is received in the receptacle, and wherein the battery pack is electrically coupleable to the second electrical device to power the second electrical device when the battery pack is removed from the receptacle; wherein the power input connector is configured to receive AC input power and the receptacle is configured to receive DC input power from the battery pack and the received DC input power is combined with the AC input power and the combined DC input power and AC input power is delivered to the power output connector; wherein the DC input power and the AC input power are coupled to the power output connector in parallel or in a simultaneous manner; characterized in that it further comprises a switch network configured to selectively connect the DC input power and the AC input power to the power output connector; wherein the voltage controller is configured to selectively connect the DC input power and the AC input power to the power output connector either by alternating between a state where only the DC input power is provided to power output connector and a state where only the AC input power is provided to power output connector or by operating in a state where both the AC input power and DC input power is provided to power output connector.