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The Phottix PPL-200 Battery Pack can be used with Canon 580EX II, 580 Ex, 550 Ex, 600EX/RT. With available Nikon or Canon cables this power supply can be used to charge two compatible flashes at the same time. Worrying about AA batteries is a thing of the past. The Ni-H power pack can fire a Nikon SB-900 approximately 1500 times at full power with recharge times of 1.5 seconds. Two SB-900s could be fired 750 times.