I just started using A123 batteries for my Rx's so I've been measuring how much mah's I'm taking out of my battery for a set of flights. The plane is a 1/4 scale aerobatic/3d bird. I've got 2 hs5645's and 5 hs 695's. Flying fairly agressivly for four 9 minute flights I'm only putting in 600 mah or so.

By the way, I really think A123's are the way to go for Rx batteries. No reg. required and very fast charge times makes them nice.