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9 volt Ni-Mh battery? The nominal voltage for a Ni-MH cell is 1.2 volts, that would mean you have a 7.5 cell battery pack?
I use a "9V" (actually 7.2V) Ni-MH battery in my Sound Level Indicator project. It can supply 230mA to light all 10 LEDs for a few minutes so I can show it to visitors. It is charged from a current-limited constant voltage which delivers a very low trickle charge current. My old Ni-Cad 9V battery failed (it was about 12 years old) and this "new" one is about 1 year old.I never understood why they made 9V rechargeables, the energy density is horrible, use a real pack =\ Or lithiums.