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This is a pack of two 18650 Rechargeable Li-ion Batteries from ExtremeBeam that feature 2400mAh capacity and 3.7VDC rating. They are designed to replace two CR123A Li-ion batteries in ExtremeBeam lights and can be recharged up to 500 times in an optional ExtremeBeam XA-B03 two battery charger or the XA-B01 single charger. They deliver extended run times and reliability to high-output flashlights. Care must be taken to make sure the voltage of your device is compatible with these batteries.