Profoto Lithium-Ion Battery MKII for B1 and B1X AirTTL Flash Heads
Get a spare battery and save yourself the trouble of having to worry
about running out of power. The Li-Ion Battery MkII for B1 and B1X
provides up to 325 flashes at full power and tens of thousands at lower
Profoto's Li-ion batteries are UN-certified so you can take them on a plane,
no matter what your destination. All the documentation you need can be
found under the download tab.