Nissin's NDP300C Power Pack Pro 300 Battery is an external power source for Nissin Di866 flashes and Canon 580EX II, 580EX, 550EX, MR-14EX Speedlights. The Power Pack Pro 300 consists of a heavy aluminum housing with a leatherette covering. It contains a rechargeable 7.2VAC, 3300mAh NiMH battery cluster (NBC300) that outputs DC 315V. The battery cluster is good for over 300 shots of full power flashes and can be recharged more than 200 times. Replacement battery clusters are available (extra purchase required) and are interchangeable with the included unit to keep your shooting going when continuous power to flash is required.
The Nissin Digital NBC300 NiMH Replacement Battery Cluster is for use with the Power Pack Pro 300 high-power battery pack. This rechargeable NiMH battery cluster can be used as a replacement for one that has expired or can be kept charged up in your camera bag to use as a spare for uninterrupted shooting when constant power to your flash is required.