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Message: <blockquote data-quote="rocketman122" data-source="post: 538689" data-attributes="member: 14443">speed and power, the eneloop pro blacks are the best. you wont worry about it but for pros the blacks will hold for about 15 months of heavy use then are no good. longer they are not as explosive in power but last longer before retiring. I use energizer 2300mah for the 7 622n slaves I have and eneloop pro blacks 2500 for the 6 flashes. not cheap. the energizer will hold for 2 years and perform just a bit less than the blacks. they are between the whites to the blacksI think fujitsu licensed the tech from sanyo and sell the blacks as well. if youre a hobbyist, energizers or the regular eneloop whites will be fine for you. my work is demanding and batteries are very important.</blockquote>