The indra battery pack is a lot of power in a compact unit when used with the indra500 ttl studio light it allows photographers to shoot 360 full power shots high speed mode its dual power ports can power two indra500 ttl studio lights simultaneously perfect for on location work the battery packrsquos led display provides instant visual feedback on power remaining in the 5000 mah cells the li ion cells can be easily changed ndash running out of power is no longer a worry allo