Al Willen is our final "Power of 5" winner. Al's tip about batteries is very useful - even if you only have two batteries that you swap. When I emailled Al to say that he'd won the camera, he said he's had a run of bad luck, so this was great news. Congratulations Al. - David.
Whenever I buy a new camera or flash battery, I mark the date and give it a sequential number. This allows me to know the exact age of the battery, which is useful to know for future battery purchases.
It also tells me the order that I put it into the camera or charger. This ensures that all my batteries are used equally throughout their life span. Once the battery is flat (during the photo shoot), I wrap a rubber band around it so that when the time comes to recharge, I recharge the "right" battery or batteries ... and not ones that still have a fresh charge in them.