I also learned the same problems as the other user:
While the battery is working, but the camera can not communicate with the battery. That would be no problem as far, only this sword also charge the battery. The light that indicates charging at me, does not light when spare battery, so I do not know now whether he is ever charged. The problem can be avoided, of course, but you have to buy an external charger for, which is not indeed the purpose of the purchase.
The price is of course great, why we have to think about whether you want to take the deficits in purchasing.