Hey everybody, Before i begin let me say i did a search and read through countless posts but did not find a definitive answer. So basically this is my question. Over summer I got a crucial 256 gb ssd and replaced my stock 500 gb 7200 rpm drive. Now I'm realizing that I do not like having an external drive. I want to install a data doubler and put the 500 gb drive into the opti bay. What will the effect on my battery life be? I read everything from negligible difference, to two hours off a full charge? I was kind of hoping for a definitive answer from the people on the forum. I can handle loosing around 30 minutes a charge, but if I am going to loose 2 hours I will continue to use it as an external. Also I was wondering if a 2nd ssd would provide better battery vs the 7200 rpm drive. Thanks for your help in advance and I am open to any suggestions or issues anyone else ran into while doing this.