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Two-Way Power: Charge Batteries or Devices :The Klarus K2 Smart Charger is a universal, dual-bay USB automatic smart-charger compatible with almost all types of rechargeable batteries and also doubles up as a power bank to charge other devices via USB with a Li-ion battery as the power. In addition to charging your batteries, it can also re-purpose them to serve as a heavy-duty power bank for your USB devices. Universal smart charger