What is meant by a loaded volt meter ia a meter that loads the circuit when using it.
An example is an expanded scale volt meter. tower hobbies has them for less than 20 bucks.
A battery can show a full charge, but under a load like supply voltage to the system rapidly looses it's charge. The expanded scale meter will supply a small load gives you a better idea how the battery will do while in use.
Don't forget to cycle your batteries so you dont develope the ni-cad memory problem

fly be free