ORIGINAL: XJet
I've never run my transmitter down far enough to get the low-battery alert but I would have expected that it would not kick in until at least 9.5-9.6V since the nominal voltage of a nicad cell is 1.2 (for 9.6V total).
It sounds as if your transmitter may be faulty.
I would guess there's a problem with the tx as well, but having said that, the low voltage warning shouldn't be coming on at 9.5 volts either! On my radios, it comes on around 8.9 volts. If you quit when your voltage shows 9.6 you are only using about half the capacity of your batteries. The transmitter will put out full power until the low voltage protection shuts it off!
HTH
Jim