NEEWER PB960 11.1V/4500mAh External Rechargeable Battery for Canon 580EX II, 580EX, 550EX, SonySB-900 SB-800 SB-80DX, Nikon HVL-F58AM HVL-F43AM, Metz Flash Lithium battery (11.1V/45mAH) Battery charging time - Approx. 3 hours Flash charging time - Approx. 1 second (full power) Flash time - Approx. 18 times (full power) note: This is just a single battery, not a whole set of power