I use it for my Canon Speedlight flashes and the lifetime is more than correct before recharging, and the battery is not discharged even several months without use. By cons I advise you to use a smart charger that charges the batteries individually (one proc per stack) rather than in pairs. Indeed the batteries should be charged differently and individually. Charger No. RS-1000 LA CROSSE TECHNOLOGY, Ansmann Powerline 4 Zero Watt, Powerex, etc ...