Extended life and speed.  Uses AA primary cells, or NiMh.  A must for shooting large indoor events that will have a high shutter count.

The Canon CP-E4 External Flash AA Battery Power Pack is a reliable and high-quality accessory designed specifically for Canon cameras. This power pack allows photographers to use AA batteries to power their external Canon flash, providing a convenient and portable lighting solution. Made by Canon, the trusted brand in photography equipment, the CP-E4 is compatible with Canon cameras and flash units, ensuring optimal performance and compatibility. With a sleek design and efficient power source, this product is a must-have for any photographer looking to enhance their lighting setup.