G'day Mate,
The nominal voltage for a TX is 9.6 Volts, 8x1.2volts. it will always be higher after a charge, & it will loose that higher voltage, in time.
If it drops below 9.6Volts, before you use it for any length of time, then I would be worried, otherwise it is OK.
The cells are not considered flat until they reach 1.1Volts per cell, or 8.8Volts, & most computer TX's will alarm at 9.0Volts, keep an eye on it, but enjoy your flying, & don't be too preoccupied with TX Voltage.