Mine does not go through batteries at anything like a fast rate - I have shot eleven films since I last recharged (and rechargeable CR2 have less than half the capacity of regular ones).
But I once had to adapt to the F5 (which manages to eat a whole pile of expensive AA size lithiums faster than even the most abused G1 goes through its CR2s), and thanks to that, I habitually do not measure+focus as I frame, but only as I release. If you are accustomed to a manual focus TTL meter camera (on some, a set of button cells is good for 10000 meter readings), you may have to readjust there.
Personally I'd recommend rechargeable cells - they are rather short on capacity, but not critically so, and are much more economical, now that the LED torch boom seems to have driven CR2 prices to insane regions.
