Tram / Sonotrim Power Supplies, the TR-79, can be acquired separately as stand alone units in tube form. Each piece comes with a 3-pin XLR male connector on one end and a male connector of your choice on the other end matching the connector on the transmitter of the wireless system you are using.
The TR-79 accommodates a single V13G long lasting Lithium battery of 1.5V. Phantom power (12V-48V) can be supplied when the battery is removed.