The Li-Ion Battery for B10 OCF Flash Head from Profoto will give you up to 400 full-power flashes on a 90-minute charge from the 3A charger and up to 75 minutes of full power continuous light run time from the B10's LED modeling light. The quick-mounting battery has charge indicators to allow power level monitoring and can be charged while in use. It's also UN-certified to allow it to be brought onto a plane regardless of destination.