Great for weddings and other celebrations

Have this battery purchased as a "secondary battery" because I document from time to time and family events -vorführungen. Now use this as a standard battery at festivals etc. One can take go through a few hours. The smaller, supplied battery is used as a substitute. With both parts I create the documentary all events wonderfully. The battery was reduced by 30%, so the price was ok. The face value (80 euros) but would have been too high to me clearly. How strange that such an exclusive for a manufacturer accessories is always very overpriced (not only for Sony). Real shame because otherwise I would buy a lot more about the device matching accessories .....