As more and more cameras are using rechargeable batteries the market for knock-off batteries has exploded.
It has come to my attention that counterfeiting of battery packs has become a serious problem for both manufacturers and consumers. A knock-off battery pack may save you money but, at the very least, may not carry a charge or last as long as an OEM (Original Equipment Manufacturer) pack. Worse yet, it could catch fire!
Here is a guide from the Camera Imaging and Products Association that will help you identify counterfeit battery packs.
Use the links below for information from specific camera manufacturers: