Just curious, I bought my Ultra way back in april I believe (shortly after they came out) and have been using the same batteries ever since. It seems lately that the batteries aren't keeping a full charge as long as they used to? Does anyone know the average lifespan for one of these batteries? Thinking that it's perhaps time to replace my batteries. I use them everyday, so I wouldn't be surprised if I wore them out. Any help is appreciated. Thanks! Al
