I haven't done any testing lately.
Just an FYI, never use "Heavy Duty" batteries in high drain devices. Heavy Duty doesn't mean they have more capacity, it means they are designed to last longer under low drain conditions, even though they also lose more of their capacity over time in storage.
I'm too lazy to look up specs for Duracell and Energizer batteries, but Rayovac AA cells have ~2500mAh with a 28mA load and ~1650mAh with a 650mA load.
Edit: Okay, I lied.
Energizers regular AA's contain 2800mAh with a 25mA load and 1400mAh with a 500mA load. Interesting.
There is a difference in testing methodology though. Rayovac specs the discharge to 0.9V and Energizer to 0.8V.
Duracells contain 2800mAh @ 50mA and almost 2000mAh at 500mA loads, also to 0.8V.
It's hard to directly compare, though, because for example... the 50mA test is 4hrs a day, and the 500mA test is 30 minutes a day. Energizer's specifications is continuous discharge.