Right I figure 85% for use and if used as high watt power source the rule of thumb is 20% / 65% available. In the case of servos will be drawing down the cell slowly.
I have noticed about 140 to 150 mah drain after 5 flights on three sub 5g micro servo's.
Note the 250mah cell charged with a smart charger will fill past 250mah as observed by my own smart charger - always puts more in than nominal ratings by all manufactures. I will try out this weekend and report the results. I have charged the battery with a 4 cell nimh using the charge in side of the circuit board, next will use the smart charger and see how much more the battery will charge at 1C need to snag a mini plug to go direct to battery.