Phottix External Hot-Shoe Flash Battery Pack for Canon gives your flash
the power of 8 AA batteries for faster recharges. Hook a huge amount of
power to compatible Nikon and Canon hot shoe flashes. For event or
wedding photographers this is a must-have item. Super-fast flash
recharging - never miss a shot. Compatible Flashes Canon: 600EX-RT,
580EXII, 580EX, 550EX, MR-14EX, MT-24EX Nikon: SB-900, SB-910 Technical
Specs Power: 8x AA type battery (Not included) Dimensions: 72. 5(W) x
170(H) x 24(D) mm Weight (without batteries): 200g Battery Type -
Alkaline-Manganese Number of Flashes (Approx. ): 250 Times Recycle Time
(Approx. ): 0. 2-5 sec. Battery Type - Ni-MH Rechargeable Number of
Flashes (Approx. ): 500 Times Recycle Time (Approx. ): 0. 2-4 sec.
Battery Type - Lithium Number of Flashes (Approx. ): 700 Times Recycle
Time (Approx. ): 0. 2-7 sec.