New design and battery.. WHY CANON, WHY?! But other specs looks nice, but I'll pass if I'm not getting good deal out of that one.
New batteries because too many cameras use the same battery and people have enough BP-E6 so they don't buy new ones. If you are a serious user, you want at least a spare one, that you have to buy separately. You cannot reuse the spare from your old camera anymore. A new accessory they can make money from.
Yes, but, batteries lose their potential life over time. So even if you have a ton, they will have to be replaced at some point. Plus, i'd bet their profit margin is a lot better on lenses!
I agree, but I guess there is no small profit. I wonder if the profit margin is not even bigger on small accessories, glass is expensive to manufacture, and you cannot compress to cost past a certain point.
On the other hand, when you see the price of lens caps, cables, flashes and hoods, the margin is huge. Not even talking about battery grips, WiFi and GPS accessories.
I am very surprised how good and long lasting BP-E6s are. I can't remember when I needed more than 2 BP-E6 per day in my 5D2, and I use it sometimes all day long on tripod with live view all the time. After 3 years + of good service, they show only minimal capacity loss, I cannot say the same for my Thinkpad who needs a new battery every year. I have 3 BP-E6 to work, and I don't see the need for buying new ones yet.