A headset for receiving and sending radio communications, comprising: left and right earcups each including electrical components of the headset including one or more microphones and one or more speakers and in one of the left and right earcups , a battery compartment that is configured to accept a power source that is either (i) a single one of a first size of battery or (ii) a pair of a second size of battery that is a different length from the first size of battery; the electrical components in the headset being electrically operable via power from the power source in the battery compartment when the single one of the first size of battery is loaded in the battery compartment , and also being electrically operable when the pair of the second size of batteries is loaded in the battery compartment ; the compartment including: a body ; a lid that is supported on the body for pivotal movement relative to the body between an open position and a closed position; and a lock that is a separate element supported on the body for pivotal movement relative to the lid and to the body between an open position and a locking position, the lid being positioned between the lock and the body; the lid having electrical contacts which are configured to engage the two different battery sizes when the lid is in the closed position, the lock when in its locking position resiliently engaging the lid to secure the lid and thus the batteries in the compartment . left and right earcups each including electrical components of the headset including one or more microphones and one or more speakers and in one of the left and right earcups , a battery compartment that is configured to accept a power source that is either (i) a single one of a first size of battery or (ii) a pair of a second size of battery that is a different length from the first size of battery; the electrical components in the headset being electrically operable via power from the power source in the battery compartment when the single one of the first size of battery is loaded in the battery compartment , and also being electrically operable when the pair of the second size of batteries is loaded in the battery compartment ; the compartment including: a body ; a lid that is supported on the body for pivotal movement relative to the body between an open position and a closed position; and a lock that is a separate element supported on the body for pivotal movement relative to the lid and to the body between an open position and a locking position, the lid being positioned between the lock and the body; a body ; a lid that is supported on the body for pivotal movement relative to the body between an open position and a closed position; and a lock that is a separate element supported on the body for pivotal movement relative to the lid and to the body between an open position and a locking position, the lid being positioned between the lock and the body; the lid having electrical contacts which are configured to engage the two different battery sizes when the lid is in the closed position, the lock when in its locking position resiliently engaging the lid to secure the lid and thus the batteries in the compartment . <EOS>