Often when a photographer is right in the thick of the action, the last thing they need is performance fade or to have to stop mid flow to change the batteries. Created for the A-series, the Profoto Li-Ion Mk II Li-Ion Battery lasts up to four times longer than cumbersome AA batteries with no performance fade, it clicks on and off the A-series flash in seconds, and can be recharged quickly. So you can shoot for longer with confidence. And the Li-Ion batteries are UN-certified so you can take them on a plane, no matter what your destination. It is a spare battery for A-Series flashes. It provides up to 450 full-power flashes depending on the A-series model and charges in 80 minutes with the A-Series battery charger. This is a certified refurbished product.