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With a high capacity that can deliver >200 flashes at 1000Ws, this Profoto Li-Ion battery is a lightweight power source for the Pro-B4. It weighs less than 2kg, and has a fast recharge time of under 45 minutes when using the Fast Charger (available separately). Its long lifetime will give users 1500+ recharge cycles. It is able to operate in temperatures between -20° to +50°C.