Yep, Rivas, even with LR atties last at least 4-6 hours. I would also suspect the charger, When you screw the battery into the charger and then plug the charger in, does the light on the charger stay red for at least a couple of hours? I often have to give my batteries an extra quarter turn to get the light to stay red. You don't want to force them in, but the first contact sometimes is not tight enough.