Why do you want to use such heavy batteries. You can get Sanyo 2500mah AA size cells and save half the weight and half the cost (though it's too late for you to save any money). 3 5 cell packs like you have weighs 30 ounces (2 oz. per cell, 14 cells).

Use these smaller packs (virtually the same capacity) and save a full pound.

TF