Futaba TX s show the load voltage. Example: CAP9 with the RF module taken out reads a voltage of about 11Volts on the screen, and If you put the RF module back in the TX the volts will drop down because of the load for signal transmission.

A *fully* charged 9.6Volt Nimh Pack should provide ~11.2Volts without load and ~10.8Volts with RF module load.
A *fully* charged 9.6Volt NiCd Pack should provide ~11.3Volts without load and ~10.9Volts with RF module load.

Ofcourse these are estimate #s but If your fully charged 9.6Volt pack shows anything lower than 9.6Volts on your TX screen, there must be something wrong with the pack. (unless theres a shortcircuit or current leakage in the tx circuit)