The Profoto Li-Ion Battery for B-Series is a quick-mounting battery that provides about 400 full-power flashes to Profoto’s B10, B20, and B30 OCF flash heads, or up to thousands of flashes when you lower the power output. The battery attaches to the side strobe housing itself, making it easy to move around with. Since the strobe can’t be AC powered, it’s a good idea to have a spare battery on hand.