I have an sb600. I have three Panasonic rechargable batteries with a 2100 mAh rating, and two Energizer's at 2500. Do I honestly face any real potential danger with mixing in one of the Energizer's with the rest of the Panasonics? I assume that the 3/1 split would be better than a 2/2 split between the two different types of batteries. What about charging them? Should I do it seperately, or is it ok to do it all at once. This is just a temporary thing, but I do need them tomorrow.