These batteries are just recommended. I photographed 10 hours in a day; and only after a few hours I got a precaution changed the batteries from the flash. Just do as far as possible to ensure to load so valuable battery with the correct charger. In order to obtain the quality for a very long time. One should ise first discharged properly after use, and then load again until. And keep this battery pack 1 year, her cargo, I believe unquestioningly. A friend has recommended it to me and also to test it.
