Bolt CBP-N1 Compact Battery Pack for SB800 & Other Select Nikon Flashes Extends Portable Flash Capacity | Option of Using 4 or 8 AA Batteries Alkaline, Lithium or Ni-MH Batteries | Thermal Switch Prevents Overheating Fast Recycle Times Up to 1.88 Sec | Up to 524 Flashes Per Charge Whats In The Box: Soft Case, Mounting Screw, 1-Year Limited Warranty