A dc/dc converter allows you to replace a five- or six-unit string of NiCd coin cells with one cell, which has enough energy to supply backup power for about 10 minutes.
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.
