The Profoto Charger for B-Series is the dedicated charging system for the Profoto Li-Ion Battery for B-Series, which powers Profoto’s B10, B20, and B30 OCF flash heads. The B-Series battery can be charged to 100% in 90 minutes and to 80% power in 60 minutes with this charger. While the battery that that is in-use can be charged to prolong its life, please note that it must remain connected to AC power while it’s charging. It has a charge-power indicator, and includes a touch-fastener strap so you can attach it to a light stand.