A portable service cart for an aircraft or other vehicle, comprising: at least one of a water ice or a CO 2 ice; an interior space having a first compartment configured to receive the at least one of a water ice or a CO 2 ice, such that the interior space has a temperature between 5°C-20°C below a temperature of an ambient environment due to the water ice or CO 2 ice that is disposed within the first compartment; a second compartment configured to store a plurality of service products; a thermoelectric device disposed on the service cart in thermal communication with the interior space and the ambient environment, wherein the thermoelectric device comprises a first substrate and a second substrate, and two or more elements of n-type (120; 220) and p-type (122; 222) doped semiconductor material disposed between the first substrate and the second substrate, wherein the first substrate is exposed to the ambient environment and the second substrate is in thermal communication with the interior space such that the thermoelectric device is in thermal communication with both the cooler interior space and the warmer ambient environment; an electronic device electrically coupled to the thermoelectric device, and selected from the group consisting of a point of sale device, an RFID reader, a magnetic strip reader, and a wireless transceiver; wherein, during operation, the thermoelectric device generates a current used to power the electronic device, and wherein the current is generated by utilizing a Seebeck effect from a temperature gradient between the cooler temperature of the interior space and the warmer temperature of the ambient environment by moving heat from the warmer ambient environment to the cooler interior space. at least one of a water ice or a CO 2 ice; an interior space having a first compartment configured to receive the at least one of a water ice or a CO 2 ice, such that the interior space has a temperature between 5°C-20°C below a temperature of an ambient environment due to the water ice or CO 2 ice that is disposed within the first compartment; a second compartment configured to store a plurality of service products; a thermoelectric device disposed on the service cart in thermal communication with the interior space and the ambient environment, wherein the thermoelectric device comprises a first substrate and a second substrate, and two or more elements of n-type (120; 220) and p-type (122; 222) doped semiconductor material disposed between the first substrate and the second substrate, wherein the first substrate is exposed to the ambient environment and the second substrate is in thermal communication with the interior space such that the thermoelectric device is in thermal communication with both the cooler interior space and the warmer ambient environment; an electronic device electrically coupled to the thermoelectric device, and selected from the group consisting of a point of sale device, an RFID reader, a magnetic strip reader, and a wireless transceiver; wherein, during operation, the thermoelectric device generates a current used to power the electronic device, and wherein the current is generated by utilizing a Seebeck effect from a temperature gradient between the cooler temperature of the interior space and the warmer temperature of the ambient environment by moving heat from the warmer ambient environment to the cooler interior space.