I just bought a 710m and got it with the 4cell and extra 8 cell batteries. I really don't plan on carrying both with me at all times but on extended trips, etc what does everyone use to protect their batteries in their bag. I am just using a regular backpack and not a notebook specific one. I would love to find a sleeve that has an extra pocket on the outside to accomodate the battery, ac adaptor and a small mouse but I fear that it will get too big and bulky to fit into a bag properly. I have read over the threads and there are so many differences of opinion but this is all about the battery and not so much the actual laptop sleeve. 
