Another vote for Eneloop. They do not discharge at a rate like others. I have also found a small solar charger helps them to last a LOT longer.
I purposely have LED flashlights for tracking, a nice little larger than pocket sized camera, and trail cams that all take AA's so I can get the most use out of my Eneloops. I have been running them for about 5 or 6 years now. They especially shine in my tracking lights.