4 in a row AA battery Speed Light Speed Loader

This convenient AA battery storage box also acts as a quick loader for gadgets that take four AA batteries in a row and load end on, such as many Photographic flashes. The design incorporates a latch that holds the batteries in place until squeezed. Compatible with Nikon’s SB800, SB900 and SB910, Metz Mecablitz 58 AF-1, Yongnuo YN-468II E TTL and MeiKe Speedlite MK-930. For video of the speed loader in action...

https://www.youtube.com/watch?v=Zn4NFlRoA7o