if someone is not enough, the number of flashes per charge: I tested with batteries of Aldi. Triggered 3x, full power manually, duration 5 seconds ie 2.5 seconds for a full charge. 2 years ago bought the same battery: 22 seconds. The Secret? The first set was loaded newly bought and with the BC700 (also from Amazon). The other batteries had verjuckelt a low loader. I have not counted, but the factory specifications for the number could agree. The flash is for me more than fast enough. Even in 75 degrees position on a white blanket go locker 4 flashes in 1.5 seconds - maybe even 5 or 6 but is not as fast my EOS300D (TTL mode f4 ISO400 object in 3 meters) The same test results with Aperture 5.6 3 flash photos in one second. Very pleasant surprise: although my SLR is already an oldie closed the communication right away. Operating Instructions Supplement: The Blitz "know" whether the lens is pulled or not. If you forget to pull eg 18mmm focal length flashes TTL button.