Everybody that runs QRP with solid state rigs knows some of the potential problems that result when the battery you're using begins to lose it's charge.
A solar cell radio used a 3V (or two 1.2V) Ni-Cad battery in it. The battery can not be removed. It use a mini jack socket for charging. Its quiet difficult to find such a voltage charger. Here is the circuit to convert the voltage from the general power supply.
