K&F Concept EN-EL14 Battery and Battery Charger for Nikon EN-EL14 EN-EL14a Battery Compatible with Nikon D3500 D5600 D3200 D3300 D3400 D5500 Coolpix P7800 P7700 P7200 P7100 P7000 (1050mAh*2)

SKU: KF28.0020

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The battery will automatically match the applicable voltage of the camera, and the use will not be affected 
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No, it has to be inside the camera to display the battery level 
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It's hard to say exactly when. You can take over 1000 shots on a fully charged battery, hope this helps. 
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The LED light will turn green when there is no battery in the charger or when the battery is fully charged. The LED light will be red while the battery is charging. 
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The LED light will turn green when there is no battery in the charger or when the battery is fully charged. The LED light will be red while the battery is charging. 
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Regardless of supply voltage, all USB ports output 5VDC, between 0.5 and 2.5 amps. Any USB connector will work fine. 
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No, it has to be inside the camera to display the battery level 
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Battery life varies with different video camera quality settings 
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one year 
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Normally, it is charged and discharged 300-500 times, and after 300 times, it begins to decay to 80% capacity, which is manifested in rapid power loss.