I use these batteries in my external Speedlite flashes from Canon and the wireless flash triggers. I must say I'm surprised. Before that, I had another battery and as expected can be the capacity to quickly. After a few times flashes with full load, charging takes longer and longer. That's why I took then only normal batteries of Duracell and the lightning hold much longer.
But as ordinary batteries are too expensive for the flashes I had to take only what battery? Another photographer has guided me on these batteries back and it was not a mistake! The endurance can be compared with normal batteries and that's rare for batteries.
