Available flying time on the (1 2/3 hr X 300 ma/h = appx 500 mah) that remained in your pack is debateable.

My .91 4-stroke powered Tiger 60 seemed to average 60 ma/min power drain from the RX pack last time I flew it. (from the results of field charging with a charger that tells how much it put back in the pack.) I imagine that it has a lot to do with the style of flying I was doing, which is mostly SMOOTH 1/2 throttle stuff. I've DRAINED a fully charged 1800 mah pack with the same airplane in 1 hour of flying (nearly 5 times the discharge rate!) when doing nearly constant full throttle aerobatics.