We always care of your attitude to the products so that we place the quality at the first place!<br>The TD-382 Flash Battery Pack for Nikon SB-900 is an external power source for a higher flash capacity. When this battery pack is connected to the flash， the recycling time is reduced to approximately 1/3 of the original value， and the number of flashes is increased by approximately three times.                                    Features            New and high quality<br>Using two group of symmetrical charge system， more sustaining charging voltage and faster recycle time.<br>Convenient design; you can either use 4 or 8 AA batteries. It will be faster recharged when using 8 AA batteries.<br>Using a new charging method， its save more than 25% power compared with original power pack. It also can be used with difference types of battery.<br>The flashgun power pack has built-in thermal protection switch， when the frequent use lead to thermal. Protection of power pack， it stop working. However， the battery pack will continue work after cooling<br>If it is 1/1 full flash， it is about 10 shots before overheat<br>                                                            Specifications            Battery    Using 4 AA duracell alkaline batteries in flashgun， using 2x4 GP 2400mAh Ni-MH batteries in power pack    <br>Flash condition    1/1 full-brightness flash per evey 30 second; when the charge cannot be completed 30 second as energy depletion    <br>Temperature    20 ℃    Power    4 or 8 AA type alkaline or NiMH batteries and AA-size lithium batteries can also be used    <br>Dimensions    170 x 72.5 x 25 mm    <br>                                                            Package Includes            1 x TD-382 Flash Battery Pack for Nikon SB-900 (Don&acute;t include battery)<br>1 x 1/4-20 inch camera attach screw<br>1 x Protector soft case<br>1 x User manual<br>                                                            Extra Info            Compatibility: Nikon SB-900<br>Other flash units are compatible with Nikon SD-9 battery pack<br>