The PT7.2-150 panel output is on 2 wires – you have to attach(solder) the wires from the Tamiya mating connector to the wires on the panel. You will have to consult your battery manufacturer's datasheet as to the maximum permissible "trickle" charging current. If the solar panel current is greater than the maximum permissible "trickle" current you will need to control the charging rate somehow – I believe that Select Solar could advise you about that. As a minimum you would need a diode to prevent reverse current flow.
Here is an example datasheet for a NiMH battery pack (not your battery pack though) :
**LINK** – it says trickle charge current must not exceed 100 mA
Ian