A question about alternative power supply for hp41 series

[wojtek]

Going back to HP41c and voltage converter.
I left 41c over the night powered by the single nimh. During 6 hours voltage dropped about 0.1V and 41c calculated more than 60000 square roots of 2. So it could give some 12-15 hours of continous work. But the nimh was the oldest I could find at home, more than 10 year old Energizer with nominal capacity of 1800 mah and real probably less than 1000mah (I was afraid of damaging any of my eneloops).
Certainly if someone would like to apply such a converter to power the 41c it would be worth to invest in the newest eneloop of 2500mah capacity