The Profoto 3A Charger for B10 OCF Flash accepts 100 to 240 VAC input power to charge the B10’s battery to 100% power in 90 minutes and to 80% power in 60 minutes. The 3A can charge the battery that you’re currently using to prolong its life, but 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.