The new brushless technology in cordless hand tools is supposed to make the time between battery changes a LOT less. I recently went with 20v DeWalt. We'll see how it holds up. They make a 5.0Ah lithum battery pack.
If you like to deer hunt, get rid of as many 'yotes as possible. Here in Indiana, a single den was monitored by a trail cam. Before the pups moved out of the den, 80 fawns were brought in to feed 'em.