Beverage container with active temperature control

A beverage container assembly, comprising:

• an insulated vessel having a chamber configured to receive a beverage therein;
• and
• a cooling or heating unit housed in a cavity of a double-walled insulated bottom cap attached to the insulated vessel, comprising:
• a thermoelectric element having a first side in thermal communication with at least a portion of the chamber,
• a module of phase change material at least a portion of which is contained in the bottom cap, the phase change material in thermal communication with a side of the thermoelectric element,
• a power storage device,
• circuitry configured to control an operation of the thermoelectric element, and
• one or more sensors operable to sense one or more parameters in the chamber or cavity, the one or more sensors configured to communicate the sensed parameters to the circuitry,
• wherein the cooling or heating unit is operable to operate the thermoelectric element to draw heat from the chamber and transfer it to the module of phase change material.